I see.
To summarise …
You highly value autonomy in backing up.
This is very reasonable.
Murena cut a backup possibility feature you liked to rely on.
That was not in any way a process any user should have to expect unannounced. I totally agree.
So for now users not using any cloud (which there are serious reasons for, autonomy among them, and pricing, and the cloud being someone else’s computer which you don’t control) are back to backing up like what was always possible to do. Quite a few of them spoke out, and rightly so, and Murena are back-pedalling somewhat, which will hopefully remedy the situation after an unnecessary mishandling of a feature loss and the connected loss of trust, wherever that trust came from in the first place (erm, hmm, or OS updates occasionally going even more wrong than losing a feature, which also happens to the best).
But you are above backing up the Android out-of-the-box way now, of course, because it’s “nerdy” (which is nonsense) and time-consuming (which I know can be very true, depending on how you want to approach it).
And now you find yourself in a corner of your own making and complain about being in this corner. You are forced to stay in the corner only by yourself, and so you are denying yourself the autonomy you seek.
Ok.
Should Seedvault be back? Yes.
Should it ever have been gone the way it was gone? No.
Should you speak out about it? Yes.
Should you dramatically exaggerate? No.
Should you be able to carry on in some way for the time being, because other kids are starving? Yes.
“Why should I trust Murena?” is a rhetorical question answering itself.
You shouldn’t trust Murena, and you shouldn’t trust Seedvault neither without really checking that it does what you want nor without a plan B, and real trust in any software product or software vendor is misplaced anyway in general, even with the best intentions included in the software, because software quality is such in general that it can always fail you. The complexity just got too high.
If you want to be autonomous, you can’t blindly rely on anything, and adding a layer of dependence (on Seedvault in this case) onto a default possibility you simply deny using (backing up the hard way in this case) will not improve your autonomy, but worsen it, as you see for yourself right now.