TwoSix
Everyone's literal second-favorite poster
Sure, but a lot of those actions are simply going to be replacing a casting of a cantrip with a 1st level spell. I'm not knocking the utility of having some extra shields and mirror images, but I don't think some extra shields and flaming spheres will make up for not having fireball and spirit guardians until level 8, or polymorph or banishment until 11.With 6-8 encounters per day, having 3-4 rounds of casting plus some bonus actions and reaction spells (thank you shieeld, counterspell, etc.) is completely reasonable. Lowballing 6 encounters of 3 actions plus a single reaction/bonus action spell is 24 spells/day right there. Not including any utility spells cast at other times.
Honestly, this kind of feels like the debates around Mystic Theurge in 3.5 days...it seemed way too powerful, right up until everyone realized that high level spells were simply more valuable than endurance of low level spells. Now, the 5e balance of spells has shifted, true...there are several low level spells that are useful right up until the end of the game. But have a 2-4 level lag in gaining higher level spells isn't nothing; there's a reason why casters rarely dip, despite the obvious benefits of Action Surge or Smite and armor proficiencies.
To my mind, a multiclass Cleric/Druid or Sorcerer/Warlock isn't a no-brainer choice under this system over a single-class, for 5e, that's all the balance I really require.