They do eventually come up, but that's not really the point. The issue he was pointing out is that, though they come up, it's not really interesting or meaningfully balance-improving to follow the RAW obsessively here. Generally speaking, it's unlikely to be a problem to allow someone to use a Bonus Action spell as an Action. Your examples show that. It's certainly not damaging to the game, nor unbalanced, to allow a Bard to use HW as an Action, and and also Inspiration as a Bonus Action. If you block that, what's the change? The Bard uses HW still, but as a Bonus Action, and makes an attack or casts a different spell as their action, and uses Inspiration next time. Did that improve your game? Did that improve the experience of everyone at the table? I very much doubt it did either.