It's strange. D&D from 3rd edition and earlier seemed to be ok with characters dying from bad decisions like the example you posted, even in standard encounters. In 4e I never saw it happen. In 5e it has only happened at 1st level.
The game is certainly less thrilling during combat as a result. Anyone can survive a standard encounter.
This easy level means there's little reason to explore to avoid encounters, find new tools and information to defeat them (plus you don't need magic item rewards anymore). Just walk up to an encounter, auto win - that's my experience with 5e. (PF2 is largely the same way, unless it's a TPK.)
It sounds like you need to be drastically increasing the level of your encounters?
Or put in secondary challenges within the encounters to increase both the challenge and interest /fun level.