Well said, johnjm22. I think that TOS, because it's a pop culture phenomenon, is considered relatively "mainstream" and accessible to a greater number of people, whereas TNG is more of a big deal with only sci-fi nerds. TNG fans are just a subset of Trek fans, so, unfortunately, in this era of pursuing the greatest accessibility and mass appeal, they repeatedly lean on and pander towards the larger fan base (the superset, rather than the subset). It also helps that TOS is "fun" sci-fi, TNG is "smart" sci-fi and fun will always beat out smart nowadays.
It's not surprising that Kurtzman, the writer behind the new Star Trek movies, helped conceive the Discovery meeting the Enterprise and worked backwards from there. That seems so predictable in hindsight.
TOS is the most memorable and iconic Trek because it was first, but TNG was the more watched show and most older millennial Star Trek fans got into the franchise because of it, not TOS. I don't think the people running Star Trek today realize that.
As a kid in the 80s, I was a pretty big fan of the movies, but, compared to what I became, I guess that you could've called me more of a casual Trek fan (much like the folks that the folks currently in charge are aiming at), since I wasn't really familiar with anything outside of the movies. I hadn't seen TOS and even missed the first few seasons of TNG. I didn't become a
huge fan until I finally did catch an episode of TNG. I was hooked and it didn't take me long to discover and fall in love with TOS (which was all over TV at the same time), as well, but I wouldn't have become as big of a fan as I became if it were not for TNG. It's very disappointing to me that, as you say, the people in charge don't seem to realize the impact that TNG had and seem bent on doing nothing but milking the impact of TOS, instead.