Yeah, if you want to have Facebook since your relatives/coworkers do, you're most likely to lose a good proportion of it. You can't really convince me to switch to Linux as the entire world works on Windows, even if it's a spyware. Same goes for Chrome, although chromium is open-source. (AFAIK)
These things are all
much easier to do than retaining your privacy when using bitcoin. If you can't delete Facebook, then just have an account to follow your friends and don't share anything. Easy. An OS like Linux Mint is so similar to Windows that it can be used by any Windows user pretty much immediately, comes with wide support for pretty much everything, and anything which
needs Windows can be ran on Wine or similar. Easy. Switching from Chrome to Firefox is almost trivial, since Firefox will import all your bookmarks, saved passwords, etc., with a few clicks. Very easy!
Compare this to only using DEXs and peer to peer trading, mixing or coinjoining everything, running your own node over Tor, and all the other things you need to do to remain private with bitcoin. If you can't be bothered to switch your browser away from Chrome for the sake of privacy, then you definitely can't be bothered to run your own node.
But, when privacy is retained on a protocol level, then the project protects the users' privacy without needing them do it for their good.
I agree with you here. Any privacy enhancing techniques need to stop being optional, since we know from experience that the vast majority of people just won't use them, which decreases the privacy for the people who do. It took almost 4 years for segwit to break 50%. I suspect it will take significantly longer for taproot, since most users don't have the same incentive (greatly reduced fees) to switch. If we want privacy, it needs to be built in to the protocol, as it is with XMR.