Be the savior you want to see in the world. More on reddit.com

Imagine that the Messiah turned out to be a plumber named Bob. Your premise is that later generations would have to be mistaken when they claimed the Messiah was a plumber because no Scripture mentions the Messiah knowing his way around pipes. The Christian understanding of the Messiah is that the Jews did not understand that the suffering servant discussed in for example Isaiah is also the Messiah. When Christians attribute aspects of the suffering servant (or just of Jesus in general) to the Messiah, it isn't (necessarily) because they misunderstand the Jewish idea of the Messiah, but that Jesus is the Messiah so any attributes of him are by the transitive property attributes of the Messiah. Similarly, later generations of followers of Bob Christ would not be misunderstanding the Jewish conception of Messiahness by claiming the Messiah is a plumber, just that by the transitive property, if Bob is the Messiah, and Bob is a plumber, therefore the Messiah is a plumber regardless of a dearth of pipe-related prophecies in Scripture. Clearly Messianic prophecy is not by any interpretation, Jewish, Christian, or other, supposed to be an exhaustive list of the Messiah's qualities and accomplishments. And I don't think the assertion by Christian theologians is that every Messianic prophecy has been completely fulfilled by Jesus as of the present, even if laymen might say this in ignorance. The as of yet unfulfilled prophecies will be fulfilled when Jesus comes again in glory. More on reddit.com

Modern Judaism is not identical to Second Temple Judaism. There were disagreements amongst the Jews about all of these things during the Second Temple period. (You can actually see Jesus directly addressing these disagreements in the Gospels.) The Scriptures used by the vast majority of Jews in the First Century was the Septuagint which pretty clearly agrees with the Christian view of the Messianic prophesies. The current Masoretic Text dates back to the 9th Century at the earliest. I'm not going to speculate about why the compilers of the MT omitted certain books, but your reason seems plausible. The Modern Jewish view is so different from the Christian one because Modern Jews are not Christians. The Apostles and nearly all of the original Christians were Jews who believed that Jesus was the Son of God and the Messiah. Any Jews from the Second Temple period who did believe in the Gospel of Jesus Christ eventually intermarried with Gentile Christians and stopped being a distinct group. Those Jews who did not believe in the Gospel were then the only distinct group that called themselves Jewish. The full schism between the Christians and the non-Christian Jews occurred somewhere from the 3rd Century to the 4th Century. (Scholars will put forward a few different dates on that one.) More on reddit.com

So there’s a multitude of reasons why Jesus isn’t the messiah in Judaism. Partly because there’s a list of things that are supposed to have happened that didn’t here’s a good walk through of it; https://www.jewishvirtuallibrary.org/the-messiah So essentially of these things, the temple and Israel are supposed to be restored (which didn’t happen), oppression and war are supposed to end (which didn’t happen) etc. On top of that there is also the issue of at the time Jesus’s lineage. So as an overview one of the requirements of the messiah is that they are descended from king David. If Jesus is the son of Joseph then potentially he was but if Christian theology is to be believed then Mary was a “virgin” and Joseph couldn’t have been his father therefore Jesus’s claim to being a descendant of David is not possible. So not only do all the things that the messiah brings not happen after Jesus is born and old enough to lead people but in order for him to be even considered you have to discount a significant portion of Christian theology to get there. Additionally the Jewish messiah is a mortal man/woman/non binary person. We don’t know who they are but their job is more to be a leader and help inspire the world to lay down arms, restore Jews to our indigenous lands where we can live in peace and have our temple rebuilt and lead people more like a king or ruler would. They aren’t someone who is to be worshiped like a g-d. And even now many progressive jews wonder if it’s not one person but many people who usher in the messianic age. So instead of one individual it’s many individuals and given the time since king David’s reign and the bottlenecking of genetics that has occurred throughout our history it’s also entirely possible large portions of our population are descendants of king David so truly it could be so many of us. All in all though while Jesus was an influential person he functionally didn’t carry out the requirements and obligations that the Jewish messiah is prophesied to fulfill. Jews are realists and practical. Half of our 613 laws are about how to live life ethically but rationally and practically. So when Jews say he didn’t fulfill the requirements it’s because literally he didn’t fulfill the requirements. Other people are entitled to whatever they believe but for Jews Jesus could never be the messiah. More on reddit.com