....
Not going to principally disagree here, as I haven't given the matter that much thought, nor do I care either way, but you just listed a bunch of solutions that are more or less the same.
F.ex. the same problem can be solved by
1. Having high CON
2. Having a feat that requires high CON
6. Having high Hitpoints (and thus high CON, as that's about it when it comes to actually being "tanky". Shields only get you so far.)
Similarly, having high stealth makes it hard to fulfill the above options. There is the niche of an evasion character with strong shields, but that still relies on chance.
Essentially, to have a sure chance to not die of random dice (well, 99% chance, it can always happen), you need high con, high stealth, and good initiative.
That's actually damn hard to do.
Still, I wouldn't go as far as saying a game is built around savescumming only because there are mechanics that may, in certain situations, result in a death that is very hard to avoid. Because that is most games.