In 5E you can cast low level spells in a high level spell slot.
I think the whole point of the slot system is to prevent players from using their mana only for the most powerful spells.
You have only 1 lv9 spell per day, but then you can still cast lots of low level spells.
Yes but you can't use the low-level spellslots for higher level spells.
The spell points system is part of 5E. It's an optional system, just as feats are. It's not self-made but actually and literally a part of the system.
Look it up yourself. ☺️
That said, you would prefer spellslots over spellpoints?
