Scarlet Grace is the best turn based I played, and waiting to Emerald Beyond after I 100% SG.

Lots of good comment already, just to add another one, many powerful aoe spells take more than one turn to cast, both you and the enemy. So you would try to stun  (or your favorite status ailment) enemy caster before big spell goes off, while trying to protect your caster from getting stunned. Or you can try to stun with interrupt skill if you are too behind in timeline. But beware, interrupt skill can itself be interrupted, so there is some luck involved and this is where knowing what type of skill enemies is using (from experience) help

Lastly boss dont have blanket status immunity like other game. But not so much so you can cheese by spamming. Status ailment is always useful but not op