"Um.... is this a troll post? Spells slots has been in Dungeons and Dragons for a long time... maybe since it's inception? I know it was around when I started playing 3rd edition in the early 1990s and still exists today in 5e. It's a staple of Dungeons and Dragons. It seems to me that you just don't like the mechanics of D&D."

No this is NOT a troll post but perhaps you are right on my dislike for the "concept" of spell slots!