Dunno if you have just given up and converted to being sarcastic now ( in which case /s would be helpful) but to answer your question: yes, having a limited amount of spell slots per fight at your disposal as a caster - the slots being your resource and being limited - makes it a resource based combat system.
Not giving up but being realistic.
I say barely resource based because you can replenish them almost every battle. Rest is unlimited so far. Everyone has access to food, scrolls and special skills like free backstab and advantage.
Seems we can toss everything and the kitchen sink every battle so let’s just go big and get more flashy. Balance isn’t the consideration. Big fun is.
