CapnZapp
Legend
I would say:It isn't strictly necessary, but life is a lot easier if you have some kind of highly annoying melee combatant with strong defenses. Champions are a step ahead here, but certain flavors of fighter and monk will do just fine.
It isn't strictly necessary, but life is a lot easier if you have some kind of highly annoying melee combatant with strong offenses.
In my opinion you can't "tank" in PF2. Monsters are simply too dangerous. This game is all about killing the monsters before they kill you, so while you need a modicum of defense, you should only strive for enough defense - enough to kill the monsters before your own hit points (including combat heals) run out. Once you have "enough" defense, you should focus on getting as much offense*, and that basically means having powerful melee warriors.
*) This is actually true in any game. The difference to 5E is that by ruthlessly maximizing offense there, you can easily break that game, while here you will want to do it just to cope...

In this game, spellcasters (other than the battle-medic) are a luxury (when playing at the default difficulty level, as exemplified both by the official encounter building guidelines as well as by official APs)
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