New spells and what that should entail

I think having a max of five spells as it is should remain as such. However i do believe having more spells would be beneficial so what i propose is after spell factory 5 no new slots are added it remains a 5 cap on spells but each upgrade unlocks a new spell that can be queued. Because realistically a level 10 spell factory housing 10 spells seems ridiculous, having 10 lightning spells? Or ten frost spells? Ten healing spells? It'd just be far too much of an advantage. So leaving the cap at 5 spells but more then 5 spells would be more strategic you'd be forced to pick only5

Comments, feedback would be appreciated