Haha, yes! I'm a software engineer and it took me a decade of smartphone usage before I realized that long-pressing various keys (e.g. vowels, symbols) shows a pop-up allowing you to enter related characters (e.g. á, æ, ¡, ₹, ±, ·, ½, ²)†. Blew my tiny little mind! If I were using a language that required the variants menu in its native keyboard layout, I might have discovered this a decade before by explicitly searching for how to enter certain characters.

† Typed these on mobile, of course. Android, in case you're wondering.