I want to see wizards snarking at each other over different magical languages/scripts, the same way programmers do it over different languages.
Sure, "High Tower is a powerful language, but it's such a pain to write. I just use Unity* as it's simple to write and can do nearly everything I need" "cranky because you can't memorize all the conjugations and declensions, aren't you?" "LOOK MAN, I CAN MEMORIZE ANYTHING, INCLUDING THE FACE OF YOUR MOTHER IN ECSTASY. IN FACT, BEHOLD!" *a little time window appears between them, demonstrating exactly that. The first wizard (seen through the window) turns around and winks at the "camera".
"you kids today with your lizardman. How can you get anything done in a language without gendered pronouns? It's like fingerpainting. Sure you can learn on it but once you've got the basics you should switch over to a REAL language"
"the Kalic have been here already. We better get out before the rest of their army marches in." "how can you be sure?" "you see that teleport?" "no" "well, if you COULD see it, you'd see it's written in Adevic Yevi. That's the Kalic magic language." "couldn't it be someone else? We saw those Monon traders, maybe one of them..." "no. No one writes Adevic Yevi unless they're being paid to. It's a language written by committee."
Wizards going on a quest to get the spellbooks for a lost spell, only to find out that it was written in skydove cant. No one can read that shit! The creator must have been one of those weird "functional wizards". (They're obsessed with making sure their spells have no side effects)
There's a small library on the outskirts of Freeport which tries to collect versions of basic spells in every language. The Adevic Yevi version of "fireball" takes up 7 pages, mostly boilerplate setting up the interfaces with fire and explosions and ExplodingMagicalBallFactorySingletons. The Lizardman version is basically "AHAHAHA, YOU GO BOOM!"
There's a bunch of wizard apprentices working on porting an old "Summon Bread and Fishes" spell from the absolutely archaic language it was written in. Once it's in Unity, it'll be easy to modify and teach to more wizards, which'll obviously be good for disaster areas. It's just too expensive to keep paying the ancient guys who can still do magic in TRAN-FOR.
Eccentric wizards keep inventing new languages for spells. You look at them and they're neat, but it'll never catch on. And either you're right, or the next time you're applying to be a court wizard, the advisors want to know if you have at least 5 years experience in Tilted Runic and you're like "it only came out 2 years ago!" "aren't you a chronomancer?" "oh good point. Yeah I've been using it for 20-30 years."
There's wizards who will spend incredible amounts of time doing silly things with spells in strange ways. There's this guy (Vorth) who made his own language where there's only one basic spell: fireball. Everything else is basic magic glue tying multiple fireballs together. So like, he's got a breakfast spell. Stand back (good advice for all his spells), and you'll see a fish get knocked out of the local pond, flung through the air by successive explosions, and eventually it lands on his plate, nicely cooked and deboned, if slightly charred (the glass of milk is harder to explain). His magical door locks involve a quicksilver sphere and molten lead changing shape when heated... It's tricky but it seems to work. He's working on a teleport spell, but so far it's mainly just killed test subjects (primarily sheep from a nearby farm).
* so the funny thing here is that this isn't a reference to the unity game engine. The main country in my One Hundred and One Magical Pistols setting is called "the union" and their language is called "unity".