Similarly, proprietary software can be secure despite being closed-source.
That depends entirely on your threat model and the kind of relationship you have with the software vendor. Software might be proprietary and closed source but e.g. you might be the only customer and did get to engage an auditor which could see the source code. Or it might be off-the-shelf software made in a country trying to spy on your company or country. In some of those cases it literally can not be secure for your threat model.
I have only tried it with wired but it uses ipxe and that is supposed to work with Android USB tethering too to bridge to other kinds of network access.
The point wasn’t so much that there are no replacements, more that every script and every shortcut and everything else using them will have to be changed to work with the Wayland alternative.
A switch from X11 to Wayland is not just a minor change to your workflow though unless you used all defaults before.
It requires you to replace your window manager, all the little tools related to things like clipboard, automation, screen locking,…
And you would have to do pretty much all of that up front to be able to use Wayland long enough to know if it even works on a permanent basis for you. That is a lot of work to put into a project that has a sketchy history of people claiming for nearly a decade now that it works just fine for everything while clearly not working fine for all use cases.
I would say that is a false dichotomy. Almost everyone agrees that X11 isn’t the future but the support for Wayland and the specific ways it does things, is not nearly as universal as that. It is just that the problem is huge and has already taken 15 years or so and so it looks like if we want some alternative to X11 that will be done any time soon Wayland is unfortunately the only game in town, no matter how flawed it is.
Counterpoint, if all of the people advocating for wayland actually worked on improving wayland to a usable state instead maybe people would actually want to use it.