I was likely playing cRPGs before you were born.
I've never played a game that had such a hard cap on spell casting.
I guess you need to pick one. Hard cap on spell casting was the norm for most crpgs, especially for the older ones.
Every D&D game setting I know of, table top and PC, as well as those that emulated D&D have a hardcap on spellcasting. Spellcasters trade off being fairly weak at lower levels for being very powerful in later levels. I do not have much experience with 5e but from what I have read and seen it remains true.
