The copy protections on Blu rays are exceptionally annoying, to the extent where there is really only one closed source software – MakeMKV – that can work around them.

Not quite, RedFox formerly SlySoft (RIP) used to market their own Blu-ray ripper and it worked quite well. What it used to do is on-the-fly decryption so you'd run it in the background and could use any other software to read the decrypted Blu-ray (e.g. using Handbrake or whatever). It did also have an option to just rip to a file IIRC. Unfortunately they randomly disappeared so their software is pretty much done. (some background on wikipedia https://en.wikipedia.org/wiki/RedFox)

That aside they always a competitor, DVDFab, that still exists today. Their Passkey software is the rough equivalent of what the old RedFox/SlySoft software used to do but they also sell a standalone Blu-ray ripper if that's more your thing (see https://www.dvdfab.cn/).

But yeah, in some ways you're stuck with MakeMKV, DVDFab, and maybe some others (?).

I'd have to dig it out but I actually bought a Blu-Ray drive a while back that was on the list of drives compatible with these rippers but honestly it's been a few years since I've tried using it. Most times someone else already ripped a Blu-ray you're interested in.

Speaking of - If anyone knows offhand, how do people do this stuff on Linux? Does the Linux version of MakeMKV work well for this and/or are there other tools (?)