> it's more likely than not that they don't have those skills
No, they absolutely do.
Even at the most basic level of interacting with the OS, Linux desktops usually offer more options in its Settings application than you'd get with MacOS.
If something annoys you on Linux, it probably annoyed someone else, and there's probably a toggle or switch for it.
If not, the barrier to fixing it is usually "sudo apt install cool_thing". Higher than "open the settings app", but it doesn't require compiling or coding. It only requires literacy (and, granted, not everyone is literate).
> Linux is ... practically just as likely to force them to accept the march of technology
For starters, let's not characterize Liquid Glass as "the march of technology". It's a symptom of dysfunction within Apple.
Second, no, this is just simply wrong. Many Linux distros offer LTS versions. Ubuntu 16.04 was released in 2016 and its support is ending this year, after a decade. (That's not counting the five more years of security maintenance.) Very importantly, these also don't have dark patterns to tick you to update like Apple did with Tahoe.
