There's a lot to grieve about, most of which has already been mentioned. My three biggest gripes at the moment are:
1. The way you have to buy figures now. You have a 5-15 minute window to preorder figures online, if that, and if you miss it, it's gone forever because most of the exclusives sell out and are never put back up. Meanwhile, you can't find anything at retail. I understand retail has other pressing issues, but Hasbro doesn't seem to want to bother since I assume they make all the money on their limited run figures.
2. Hasbro's lack of enthusiasm for the line. It's painful watching the Marvel Legends reveals and seeing either a slew of new figures, or repaints that make sense. For example, I'm loving the retro Spider-Man figures on the 90s Animated Series cardbacks... those are a GREAT mix of new/kitbashed figures, or repaints that are accurate to the cartoon. And even then, the people in the presentations are just so excited to show the stuff off. Then you get to these boring Star Wars reveals where it's a corporate suit spouting out corporate buzzwords while introducing a metallic repaint that costs double the price of a basic figure. It just feels like the line is an afterthought, and Hasbro doesn't care about it anymore.
3. The fanbase. Long gone are the days where we critique and analyze everything from figure inaccuracies to articulation in a friendly manner. Now, the sequels have brought in new collectors who eat all of these repaints up with a spoon, and if they see any criticism whatsoever, they pounce on you with the "shut up and buy it and then get excited to buy the next repaints." I know we had arguments in the old days, but you never felt personally attacked for the most part. Now you're "not a real Star Wars fan" if you don't want to buy Carbonized Boba Fett or Obi-Wan: the 10 Year Old Rerelease of a Not So Hard To Find Figure. Forums like these are unfortunately a dying breed, being replaced by things like Discord and Reddit, where if you don't follow along with the groupthink mentality, you get downvoted to oblivion, or outright banned.
Having typed all of that out, it makes me realize... it's not really fun to collect at the moment. Hopefully things start to change soon.