I think Cherry MX Blues do lose a bit of their click and tactility with use just based on my limited experience. I have a board with MX Blues that I used at work for three years, and it seems less crisp than a blue switch in my switch tester. It could also be that I experience with more switches now, so I just notice more nuances than I used to.
I do recall reading about some differences in Cherry MX Blues from a certain span of time (like 2014 or 2015) where they didn't feel as good or weren't as consistent. I'm not sure though since that was before I really paid attention to this stuff.