I don't agree that this is a credit to PF2E. In 5E or PF1E, or pretty much any system you can easily throw dangerous encounters at a party. If you went through the 5E monster manual and subtracted 1 from the CR of every creature, they would not be any more dangerous. The metric for how to apply them would have moved, but the encounters would play out exactly the same. Fudging the scale to more deadly should make no difference to a good GM. The GM should just apply the scale appropriately and create a fun game.