Agreed and also hard disagree on some part of it.
I agree only with the “fit all possible threats” solution when this actually helps making things more convenient for you in progressing your privacy journey.
For example: using Mullvad Browser with Mullvad VPN. It’s a great solution to browser privacy while arguably more convenient than manually hardening your browser, depending on how much you relied on extra extensions.
But on the contrary, there are things that will destroy your convenience if you go with the “fit all possible threats” solution.
CubesOS is still for a select group of people due to the convenience downgrade.
Switching entirely to Linux (no dual boot) is still for a select group of people due to the convenience downgrade.
GrapheneOS or any alternative ROM is still… etc. You get the gist of it.
You can’t go your entire privacy journey only having “black and white” opinions on privacy. This is what a threat model is for. So you can reduce mental load and do the things that matter for your threat case and intentfully balance that with your personal ideologies.
Also: therapy will help. (Speaking from experience)