memes

They used it to create potions and spells that are equivalent to the medical industry, as well as the beauty industry, sports, frivolous things like that.

It's implied serious research goes on, but never really shown.

There's also wizard versions of cops, and government officials, naturally.

Magical knowledge replaces engineering and math as well. A civil engineer's building design equivalent would be a series of complicated spells put on a small building to make it a massive one inside.

Also in the books, Hogwarts was really only secret to the muggles, every wizard in Britain knows where it is.

But imagine all the high schoolers who complain "why do I need to learn algebra, I won't even need it in [job]. It's like that. Some won't need it, but it's still a useful skill.