Well, you do you.

I talked about that with my players in session 0 and they would rather have consequences and a challenge instead.

So far we had 2 PC deaths in 3 years of pathfinder 1e but many close calls. If I were to TPK them fair and square (either because of unfortunate crits on my part or them getting cocky or just plain old messing up) I would do so. I have 0 interest in pulling some “37 red dragons appear, roll for initiative” bullshit but when, like last session, they choose(!) not to heal between encounters and then continue exploring heads might roll.

I don’t intend to TPK them but if it happened we would have a conversation about how to continue, probably either with a new party or an epilogue.