That is so true. Plus, with presets, you have to, as you touched on, spend probably MORE time managing Reactions to make sure they're set right. And God forbid you forget to mess with them before ending your turn. "Oh crap! I forgot to turn off Shield Reaction. Now my Counterspell won't work!"
Fireball. Everyone's half dead. I could see myself doing that constantly, But at least you shielded that magic missile. Yay you!
Yeah. For the most part, popups. Like I said earlier, they really aren't that annoying in Solasta, and they really don't slow combat down that much. Very miniscule.