If you are in a field full of enemies, then you are in a field full of trash enemies and maybe 1 to 2 tankier dudes. The majority of your enemies will die in 1 to 3 hits, while the beefier dudes you'll need to save for last. So fight accordingly.

This is a fairly common occurance with the raids, so I'll give you the benefit of the doubt and say that you arent pulling way too much when you shouldnt be (instead they're bringing the party to you). This could also occur in the plains with the villages, but you should be able to pull less than 5 fulings most of the time.

Anyways, the game is balanced such that you can rapidly take down an individual normal trash monster as long as you've been keeping up in gear. Or 2 or 3 monsters, and then you're going to run out of stamina. When you are in these situations, where you have a group larger than that, managing stamina is the entire thing that the situation is balanced around. Will you take down an enemy and then preserve your stamina so you can survive and dodge better to take down the next enemy? Or are you going to take the riskier move and spend all your stamina to take down as many as you can at once, but risk getting overrun? How does the situation change if you are a shield user? or a sword user? The shield can take those hits, and reduce the stamina cost, but at some point you have to counter attack. Where you see an annoying experience, I see an experience the devs balanced finely around, behaving exactly as they intended it to. They want you to spend your stamina points carefully, which is why you dont get a huge amount of them, and why weapons get more expensive to swing as you go up in gear and food levels; and if that means you draw that encounter out a lot and it takes a few minutes instead of a moment to resolve, well, then its functioning as intended.