If this were a thread about how each individual one of us does things, the argument would be 100% irrelevant. That would be an "is" conversation.
Note the thread title. Emphasis added: "How Often
Should a PC Die in D&D 5e?" This is an "ought" conversation. It is saying how things
ought to be. In other words, it is setting, to at least some degree, a normative standard, a jumping-off point or baseline which must be modified away from. Always, some trace of a default must exist, even if it is pretty minimal. 5e does not have a minimal default, but rather a pretty extensive one--tailored to consumer surveys.
But, if you like, I am quite happy to never use the "popularity" argument ever again. If I do do that, though, I won't accept criticisms of other things that are based on whether they were popular, well-received, or well-understood by the audience at the time. Obviously I'm talking about 4e here, but it goes for any game.
When house-ruling is sufficient to "make these games play the way we want",
anything goes. Every game can be made to play the way you want. The term has been devalued into uselessness. In other words,
@krillinfan's argument remains and you've done nothing whatever to actually refute it.