It's a fictional medium about over the top actions, just enjoy it if you do, don't if you don't. Pointless criticism that will never reach the author won't change anything. Now, if you'll excuse me, I'll go back to reading my trashsekai since it doesn't need to make sense for it to be fun.
Glasses are really versatile. First, you can have glasses-wearing girls take them off and suddenly become beautiful, or have girls wearing glasses flashing those cute grins, or have girls stealing the protagonist's glasses and putting them on like, "Haha, got your glasses!' That's just way too...