The issue is not if you will end up buying machines where you can't boot Linux because secure boot can't be switched off. That will not happen, among other things, due to anti-trust issues.
No the problem is that secure boot is the first in the chain against "trusted computing." I.e. to play your media files you have to have booted a trusted OS which only allow trusted software to open your files. Later on your bank will require you to use a trusted OS to do net-banking. Then all kinds of services will require it. Then the ISPs will require it for you to access the internet at all. Then states will require it to make sure you can't access child porn, bomb manuals etc. We all know where that road leads to...
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