[Aerich]

If by "best" you mean "with the least risk", then yes, battles are "best" handled in the way you describe.

That doesn't mean that all battles can or have to be handled that way. You have full control over whether you cast different spells or use different tactics. Additionally, there are some fights later on that cannot be handled in this manner, because the enemies are too big, tough, and spell-resistant to be entrapped.

There are a lot of comparatively low-level hordes of monsters, as in the Severed Hand, and you may wish to conserve your spells and approach your fights differently. If you want to challenge yourself, try resting less than once/level.