That's like saying that hardware should be only repairable by vendor because majority of humanity doesn't have skills to fix it themselves.

That's not even close to what they said.

They said, you can do it "if you have the skills" and that "the large majority of humanity does not" have these skills.

That's literally what they've said. They imply that having ability to change something is useless, because only a minority can leverage it.

Do you have access to private jet? Because everyone has access to, for instance, Atom source code. Even if they can't use it.

Everyone has access to private jets, even if they can't afford them.

https://www.avbuyer.com/aircraft/private-jets

Anyone with access to a computer (a prerequisite to use software in this context in the first place[0]), also has access to the tools to learn to perform these actions.

Pretty sure most people don't have the ability to teach themselves to fly a private jet and then walk up and take off.

[0] Setting aside phones/mobile. Yes they exist, yes they're important. No they're not relevant to this thread.

Ah yes. I have the time and the knowledge to "just" remove that code and "just" build that version. When even the simplest libraries can't usually be built using the instructions the authors leave for them (if they even do that)

You don't have to remove the code, you can just pin the version you're using and go for quite some time (sensitive to security context). Most builds are pretty easy to do with 5 minutes of following instructions or whatever build tool. I did this exactly thing with termux (an app I relied on) when they removed sending sms due to a google rule change.

Also, you only have to do it if you're the only one left. Chances are very good that there are others in the community that may step up wholly or in part. Sure the risk is non-zero, but the point of freedom is that you could if it came to that.

Maybe you don't, but somebody else does.