Normally, having an elemental affinity means that you have potential and talent as a magician, although this is not always the case, as in Lys's case.
And yet the trainers, or rather the kingdoms, want to raise as many mages as possible, so they focus on the fact that someone has affinities or skills that help them with magic and encourage them to change their path.
In fact, many in our group at the beginning of the year, such as Ban, who had a slight affinity for wind, were recommended to start magic classes.
But I advised him that even if he did, he should not abandon being a warrior with high agility.
The same thing happened with Alice in my previous life, who was a mage for a few years until she discovered her talent as an archer.
So, while I don't think it's wrong to learn magic, it's better to stick with what you're really good at.