Really? GNOME is not what I would recommend to people.

I should applaud their efforts, and I get that much of it is voluntary, but their bugs are numerous, notable and the way they interact with the rest of the universe (both people with accessibility needs, and the wider developer ecosystem on linux) can most accurately be described as arrogant and hostile.

KDE is the bastion of maturity here, and I would agree that it is mature.

I’m not sure how the love for GNOME continues when KDE (while not my personal choice) has clearly been running circles around it since GNOME3 and the gap has only widened since that change too.

Both desktops are pretty mature. I've run both of their Wayland stacks, and Mutter/KWin both perform great these days. It really comes down to personal preference for most use-cases.