No, DRI3 is default in Arch and with that there's also heavy tearing, and I must enable tearfree plus vsync. DRI3 actually has a weird bug when opening a video

No, DRI3 is default in Arch and with that there's also heavy tearing, and I must enable tearfree plus vsync. DRI3 actually has a weird bug when opening a video with mpv, where you can watch for a split second how a small rectangle is resized to the desired video window's size. This doesn't happen with DRI2 or Wayland. All of this is most likely very GPU-dependent, so Debian cannot make a decision like that with confidence. I understand that the simple modesetting driver relies on Mesa and there's no UXA or SNA code which can introduce bugs, but I can assure you that when I tried the generic modesetting driver, it was one big tearing party. BTW, DRI2 and DRI3 in Glamor mode is pretty much the same as the generic modesetting driver, because the SNA code isn't used at all. I've been tyring my best to migrate to Wayland compositors, but Xwayland integration is still too buggy. But it might be an easier solution than messing around with xorg.conf.