IMO there’s nothing wrong with a discussion of buying well, and it happens here all the time and people do not complain or call it boring. It happens a great deal in the vintage section, where people offer their thoughts on prices pretty regularly.
But that is very different than talking about buying a watch purely as an investment, asking what watch will gain the most, etc. That is what I personally find boring, and I’m not uncomfortable saying it.
I think there’s a bit of a divide I’ve seen on forums. While it’s certainly not universal, people who entered the watch collecting world in the last few years tend to either be more interested in, or more tolerant of the investment type discussions. People who were in the collecting world before the market went crazy are generally less interested or tolerant of it. I suppose it’s human nature that people don’t like change, and I think most collectors who have been involved for many years don’t see these discussions as a good change, as it detracts from the actual watch talk.
YMMV...