Let's say that for whatever reason, you had the option to keep Rydia with white magic.

If you take this route, the game weakens the use of black magic, and you don't learn as much of it. The summons are untouched. However, Rosa still learns high curing and status based spells while Rydia would get better versions of what would eventually be time magic.

Would you do it, or leave it how the game actually is?