TwoSix
Everyone's literal second-favorite poster
Except the core rules give you that extra utility outside of combat for free, and don't require a trade-off.But that's not the trade, you're not getting anything extra.
I'm coming at this from the premise that it's obvious that casters are overall more useful and powerful than martials in core 5e. If you think they're actually balanced, than obviously this sort of project seems flawed. From my perspective, you could add 10 minutes to the casting time of every spell in the game and wizard would still be a useful class.