We're in a state of decline in a number of areas. I agree with you with regard to macOS, but Windows has degraded far worse than even the most cynical among us would have guessed just 5-10 years ago. Linux is great in my opinion, but there's no reason to think it's immune. What happens if corporate interests get even more invested in Linux? Just look at Android. Or, when Linus Torvalds passes, will there be good stewardship? Will the government require ID verification that simply won't run in Linux? The modern computing situation is quite fragile, and many options are receding on a yearly basis.