I think the rule is worded really badly in a way that makes it more confusing that it needs to be.

As for the rule itself, my table usually hand waves it and lets you cast whatever you want with your bonus action and action, provided you have the slots to do it. We haven’t had any issues with that feeling game breaking for us yet.

Which rules about bonus action spells are you referring to?

Cool insight - thanks!

I feel like every week we hear about some huge breakthrough that is supposed to revolutionize clean drinking water technology and save the world, but nothing ever comes of it.

I know this stuff takes time to develop, and not every idea is going to work, but it would be nice if one of these things actually did pan out and start being useful to solve our drinking water issues.