It depends on what the situation is.

I play with permadeath and reset in the event a character is killed. Why? To learn. I fucked up, so how can I create a better strategy for this encounter? Where did I go wrong? Did I overextend the character thinking they would be fine? Did I fail to realize a stronger enemy or one with a better weapon had moved into…

Disagree. I got pissed and turned off permadeath after losing a weak unit 40 minutes into a chapter repeatedly...and being able to march your entire army to death DESTROYS the tension of the gameplay ENTIRELY. It felt awful.

Not exactly. Resetting the game when you get a death is still accepting the higher difficulty of permadeath, in a way. Because that means that your success state for a mission also includes ‘no deaths’. With no permadeath, you can let your weaklings die every mission and still keep on truckin’ happily.