lams may have been canon and it's ok for people to appreciate the fact that they were historically together, but shipping them and writing fanfics goes too far.
if you want to put it in perspective imagine one of your relatives had died and then some people found out that the person who died was secretly with someone else, and then they started making fanfics, fanart, and smuts about it. that would be weird, right?
the same thing goes for shipping characters in Hamilton. they may have been dead for a while but it's still weird and honestly, not that different. also lin may have put in hints that they were more than just friends but that does not mean that he's always like "I ship it! uwu"