I think the problem is, at the very top level, TI/MD doesn't really provide a huge advantage. That's why a lot of top players, even if they don't use TI/MD too, can handle these players. But perhaps at lower levels it does make a big difference and it is harder to beat them if you can't time a perfect slice to the baseline off every shot.
The same goes with mistiming shots. At the top level, hitting a too late or too soon shot is often a death sentence. It may not go out as an unforced error but believe me, they are punished. I think possibly at lower levels poorly timed shots aren't really punished with the same intensity so it doesn't feel like it's a big disadvantage to them. So at the top level, unforced errors off poorly timed shots would not be beneficial and would be worse I think. Attacking tennis is a much bigger advantage than defensive tennis and more unforced errors off poor timing would make it even harder to defend reducing the top level game to nearly just all attack. The majority of mistimed shots are when defending, almost never from attacking positions.
I think these things that people are complaining about, they make a far bigger difference at lower levels than at the higher levels and that's why we don't really see any of the top players experiencing these problems or feeling that a lot needs to be changed about the game. And possibly also why there's such a split in opinion because top players don't experience how it affects the lower ranked players whilst lower ranked players don't experience how it doesn't affect the top players.