To many players, having FFA loot or personal loot is a simple, small, reasonable, QoL change.
I do understand that in your opinion it’s one of your biggest loves of the game, and really important, but it’s not the same for everyone.
Some people find shared stash to be a lot more than just QoL, and changes their gameplay significantly.
Some people feel stacking runes and gems is a terrible idea, and for some it’s simply a QoL adjustment.
We all need to come to terms with the fact that people played D2 differently, and things that are important to some players are completely irrelevant to others.
Some people love inventory Tetris, and some people find it tedious.
Some people want to be able to manually refresh vendors.
These all can be argued to be QoL, or core changes, depending on perspective.
None of these can be considered “wrong”, it’s a difference of opinion.
For me, I think changing the drop rates on runes and uniques would be changing core gameplay, but for some people they would find it to be “Quality of life” based on the shortened ladder length.
Even shortening the ladder length could be considered a “core change”, or moving Ladder-only runewords to non-ladder.
I would argue some of these changes are much more game-changing than a personal loot option.