I don't get why people are still harping on why he can't use elixirs anymore and calling it a silly excuse.
If he was still able to use elixirs people will just comment on how broken Elixirs are. It's so broken that any sense of urgency will just be thrown out the window.
The reason for why he isn't able to use elixirs anymore is because of how his magic isn't really the same ever since he first overwhelmed himself in his childhood and his maid needed to seal his magic. The way he unsealed it wasn't really undone by his maid and was just forcefully undone.
Drawing up summons does not equal Item summoning. One is just done anywhere, and the other requires a magic paper which burns whenever he draws on one.