Wayland has its issues to be sure, but the X Window System was no longer suitable for modern systems; the justification for replacing it was quite sound.
GNOME I'll heartily agree on. But I've never liked GNOME myself (v1 seemed OK though) and have always criticized that project. I've always been a KDE fan, though admittedly they've had some similar problems and have handled some major changes rather poorly (esp. 4.0). Really, the desktop environments are one place where FOSS hasn't really done that well, frequently re-inventing the wheel for questionable reasons, or adopting questionable new design philosophies. At least there's a fair amount of competition in the space, so if one project rubs you the wrong way, you can try another; this proliferation of competitors also shows just how much disagreement there is in the community on this particular matter.
I really don't know enough about the audio stack changes; I can only guess that they found big problems with older solutions there which required major architectural changes, esp. for certain high-performance applications.
GNOME I'll heartily agree on. But I've never liked GNOME myself (v1 seemed OK though) and have always criticized that project. I've always been a KDE fan, though admittedly they've had some similar problems and have handled some major changes rather poorly (esp. 4.0). Really, the desktop environments are one place where FOSS hasn't really done that well, frequently re-inventing the wheel for questionable reasons, or adopting questionable new design philosophies. At least there's a fair amount of competition in the space, so if one project rubs you the wrong way, you can try another; this proliferation of competitors also shows just how much disagreement there is in the community on this particular matter.
I really don't know enough about the audio stack changes; I can only guess that they found big problems with older solutions there which required major architectural changes, esp. for certain high-performance applications.