I'm not just talking about a Perl script running on Apache like it's 1999. I'm talking about globally distributed cloud apps. It might be theoretically possible with X11 but it doesn't actually exist. Maybe we could envision a world where x11s://docs.google.com transparently opens an SSH connection, sets up X forwarding back to my local X11 server, and allows me to work with "Google Docs" the X11 client app just like how a browser tab works today. But nobody's written that, and they haven't written any of the myriad pieces of infrastructure to allow it to scale to a global user base either. That's not even getting into the security and interoperability concerns between apps running on different hosts which the browser has (not always in the best way) already addressed.
> how is Wayland's architecture much different from X11's again?
Honestly, I don't know that Wayland is really that much better. Though I think abandoning network transparency was the right move, I can't say I feel the same about any other decision (mostly due to ignorance). It seems to have stabilized enough after 15+ years that the major desktop environments and distributions have (mostly) adopted it, but honestly I've never seen any tangible benefit as an end user. I too have asked "why not X12?" but I don't know that it was any more feasible. The competitors (Windows, macOS/iOS, Android) were all able to deliver more coherent experiences (and in a lot less time) because one entity owns the whole window system stack. Wayland set out to maintain a lot of the same agnosticism X11 had about particular details; while perhaps inevitable given the goals, the end result is nowhere near as simple and cohesive as the competition.
If your opinion of a technology is based on how widely it's deployed, I bet you think the iPhone is the best thing ever and touchscreens are the right way to control cars.
X11 did network transparency wrong. Nobody in that ecosystem stepped up to do it right. The web does it better, even with its warts. Citrix is going to find its way into the same graveyard before too long. This isn't a problem Wayland can solve given the way desktop and mobile apps already work.
Delivering a working desktop experience is more important than trying to achieve some kind of purity about what seemed like the right thing to do in the 1980s. Even RISC CPUs have adopted SIMD and task-specific instructions like cryptographic acceleration. VNC and RDP are good enough. Wayland has taken so long to reach maturity, I think, because it tried to do too much more than what was actually necessary.
But most of all, the biggest strength and weakness of open source is that it allows anyone and requires someone to put in the work. If you think X12 is the right solution, then all you need to do is make it happen. For all my gripes about Wayland, it exists in large part because nobody was really trying to keep X alive and working well on modern computers.
I'm not just talking about a Perl script running on Apache like it's 1999. I'm talking about globally distributed cloud apps. It might be theoretically possible with X11 but it doesn't actually exist. Maybe we could envision a world where x11s://docs.google.com transparently opens an SSH connection, sets up X forwarding back to my local X11 server, and allows me to work with "Google Docs" the X11 client app just like how a browser tab works today. But nobody's written that, and they haven't written any of the myriad pieces of infrastructure to allow it to scale to a global user base either. That's not even getting into the security and interoperability concerns between apps running on different hosts which the browser has (not always in the best way) already addressed.
> how is Wayland's architecture much different from X11's again?
Honestly, I don't know that Wayland is really that much better. Though I think abandoning network transparency was the right move, I can't say I feel the same about any other decision (mostly due to ignorance). It seems to have stabilized enough after 15+ years that the major desktop environments and distributions have (mostly) adopted it, but honestly I've never seen any tangible benefit as an end user. I too have asked "why not X12?" but I don't know that it was any more feasible. The competitors (Windows, macOS/iOS, Android) were all able to deliver more coherent experiences (and in a lot less time) because one entity owns the whole window system stack. Wayland set out to maintain a lot of the same agnosticism X11 had about particular details; while perhaps inevitable given the goals, the end result is nowhere near as simple and cohesive as the competition.