Thomas Shey
Legend
There are absolutely play imperatives where conjuring threats out of thin air is not considered playing in bad faith. On the fly encounter adjustments have been advocated for by several people on these boards.
I do think you can run a game in a way that is sensitive to skilled play in trad games, but it is seldom the case that playing skillfully is required. Most games are just not tuned that tightly.
Though, and to make it clear this is not intended to counter your more general point, one of the things often directed as a dislike at Pathfinder 2e is that it does demand some degree of skilled play if the GM is not actively accounting for its lack in his group (i.e. a group that just wants to bull ahead will most likely run into serious problems if the GM is using normal encounter calculation options). D&D4e seemed to demand some degree of that, too.
I'd also suggest that being overly casual with how you play Mythras is not going to go well. There are probably others I'm not thinking of.