Oh, I see. You didn't actually familiarize yourself with how the rules work, rather you just looked at what you assumed would be the most powerful summons, and judged by those.
You see, PF2E
does let you do stuff like summon a
Kaiju, or an
Army of Dragons. But rather than putting those onto the board as creatures with HP and their own actions, it just represents the effects that momentarily calling upon such power has via "Incarnate" spells. The creature (or creatures, if the spell represents multiple) does one thing when called upon, then on it's next turn it moves, and then it departs which does another thing.
So if you summon Agyra, the Forever Storm, you do summon a gigantic, two-headed pterosaur-kaiju, which immediately shoots out two beams of electricity for a fair amount of damage, which also slow down whatever they hit. Then it swiftly flies to a new location, and unleases a 100-foot sonic wave for even more damage that knocks it's targets prone.
Which, y'know, is pretty cool and more balanced than "I summon several hundred HPs worth of ablative meat".
As for "out of combat summons" - yes, summons generally only last a minute.
But you can very much still do the thing where you summon a creature for it's spells, or other abilities. Summon a strong animal to clear a rockfall. Or
summon a
Monadic Deva to get Heal, Remove Curse and Remove Disease.
And if you want longer-lasting services out of combat,
that exists too.
Heck, you can even get a same-level summon of your level that'll fight with you in combat without counting as a minion or using any of your actions that way. But I guess that's not strong enough because it'll take a day to cast the ritual and the creature will actually demand payment for that, rather than taking 6 seconds and a spellslot to break the action economy.