Yeah in retrospect you can pinpoint the decline as starting with Resident Evil 4. In it you can see a very clear example of widespread celebration of a specific genre (survival horror) being dumbed down to cater to the braindead masses, with everything that made that genre special being excised in favor of "convenience," to the point where that genre disappeared entirely. Highly specialized genres with a lot of unique gameplay systems, that the player is responsible for learning and adapting to, being dumbed down in favor of turning all games into basically similar, banal pap is one of the clearest signs of decline. Basically globalization for video games.
I posted these in the The Last of Us 2 thread but I'll repost them here, since it's more relevant in this thread anyway, and really no one should be reading a Last of Us thread.
"In a highly welcomed move, Capcom has eliminated the ribbon-based save system that has been the backbone of the Resident Evil series. Now, you can save wherever you can find a typewriter, and thankfully they're located conveniently about the huge world."
https://www.ign.com/articles/2005/01/07/resident-evil-4-7
and praising the general dumbing down of all the survival mechanics (this one is especially good because it shows that people were always decline enablers, developers just hadn't begun catering to them en masse):
"I have played all of the Resident Evil games, but rarely all the way through because of the series' unforgiving resource management. Ammunition was so scarce that I would often end up bulletless and surrounded by zombies.
I often found myself at the end of a major battle in Resident Evil 4 with only three bullets left in my weakest weapon, but I soon discovered that this was not the end, as the game will spread just enough ammo around the next area to keep you going. You will also encounter merchants who exchange the treasures you find in your travels for weapons and health items and will upgrade guns to improve their power or reload time."
Others were even wishing that the game was further steamlined and retardified:
"There's one aspect of play that sometimes interrupts Resident Evil 4's exquisite pacing, and that's the necessity of having to fumble around in your inventory. Though you can readily switch between a gun and your trusty knife at the touch of a button, switching between different guns (or using healing items) requires you to go in to the inventory screen. A more streamlined means of weapon switching would have been convenient,"
https://www.gamespot.com/reviews/resident-evil-4-review/1900-6115968/