Yes, I know that's not completely true. I _could_ use Linux (I even used Solaris on a notebook for 2 years in the past and I survived) but the cost in terms of effort, lost productivity would be higher than I'm ready to pay. It's a rational choice.
Are you sure of this? Wine (or Proton for graphics stuff) is pretty good.
Also someone told me here that LS should be considered harmful.
The implications of this are unclear. I like blowing these claims out of proportion, but in reality we genuinely have no idea what this means. It could simply signal that Apple is complicit with benign cloud-storage security procedures enforced by the USA. It could also mean that the US has carte-blanche access to iCloud data and decryption keys. You're free to draw your own conclusions, but the surrounding context seems to imply that Apple has an under-the-table relationship with our government (as does most of the tech industry, surprise surprise).
Oh, and I don't really know/care if LS is harmful. You should be aware that it's not going to outsmart Apple if they want to collect your info, though. They have kernel-level networking access, which companies like Microsoft have abused in the past to collect telemetry on crafty users. It's probably not harmful, per-se, but your perception of it as an impassible wall might be.