ELI5 the whole Wayland vs X11 going on.

I think the drama around Wayland can be explained by the sentence “it should be a drop-in replacement like pipewire but isn’t”.

Without taking a side on that issue, I will point out that this was not a goal for the Wayland designers ( in their own words - I do not have time to go find a quote but have read this sentiment many times ). Wayland detractors agree with your sentence and, given that expectation, are legitimately upset and even confused that Wayland continues to gain mind and market share against X11.

If you feel that Wayland needs to be a drop-in replacement for X11, it is not ready and may never be. By that metric, some people see Wayland as a failed technology and perceive Wayland users as shills and zealots.

If you are interested in a display server that addresses some of the core design problems in X11 and do not mind moving to something new, Wayland is starting to look ready for prime-time.

If you are non-technical and / or unopinionated the debate is probably irrelevant. Wayland will most likely become the default on whatever Linux distribution you use sometime in 2024 or 2025. You will be a Wayland user. Maybe you already are.

If you are willing to step outside the mainstream, using X11 without Wayland is going to be possible for at least another decade. That said, I am saying “outside the mainstream” because not only will popular Linux distributions and desktop environments start to become Wayland only but the innovation is all going to move to Wayland. There will be many Wayland-only compositors, apps, and features. 5 years from now, not using Wayland is going to really limit the desktop experience. I expect some toolkits ( GTK, Qt, and maybe even WINE ) to drop X11 support at some point ( maybe not soon but sooner than 10 years maybe ). 5 - 10 years may seem like a long time but it will likely come faster than X11 stalwarts expect.