but the casters are more frecuent and nasty in the tabletop.
I disagree; i mean, certain spells like stop time and wish aren't in the game BUT the spells that works differently than on video game works BETTER. For eg, Animate dead on P&P require corpses, on PFKM you can create d4+2 CR 7 skeletons that has a lot of immunities, so you can put enemies under cloudkill and similar spells while your skeleton wall tank the enemy.
And Kineticists due enemy AI and lack of fly(they could make wings ignore ground effect) has a wing button called Deadly Earth. I still prefer it over making it useless(like nwn2 did with chilling tentacles, no grapple and a fix +5 to hit when on P&P it has grapple and caster level + 8)
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About "difficulty spikes", people trying to fight great wryvns at lv 2, complaining that Bears can OHK your lv 2 guys with a critical, that can't hit a swarm with a axe...
Did this guys played BG1? You can find Basilisks early on and they can insta petrificate your party members. Stone to Flesh is a tier 6 spell which you can only obtain wish ultra expensive scrolls.