Revisiting this idea, it occurred to me that it doesn't make much sense to keep generating low-rank spell slots during your daily preparations at higher levels. If the whole point of this rule variant is to encourage players to unblend their spells, they might end up ignoring the ability completely if they're still naturally gaining plenty of spell slots at all ranks.
So, I made a revision to the linked document. Now, full spellcasters will gain spell slots in a manner similar to bounded casters (i.e., they only gain spell slots in two ranks). But unlike bounded spellcasters, full spellcasters gain a LOT more slots in those two ranks. Potentially, they could even exclusively cast only the two highest ranks of spells available with all of their slots. But I don't think they will, on account of three reasons:
1.) Cantrips are an unlimited resource, and as long as those are sufficient, they won't waste limited resources to get the job done.
2.) Depending on the campaign style, focus spells may be more plentiful, and depending on the class, those can be competitive with regular spells.
3.) Any player or GM worth their salt knows that it's better to create at least a few low-rank spell slots for utility spells. An ounce of prevention is worth a pound of cure.
4.) Heightened spells tend not to be very cost-efficient when it comes to changing HP values, up or down. As long as you're not up against the wall with just one round to make or break everything, you're usually better off casting many less-heightened versions of spells instead.
Four. The four reasons-- Amongst the reasons for-- I'll come in again.
