In my opinion, the imbalance of secondary skills is perfectly normal. And if it seems right to strengthen water and fire, why doesn't it seem right to strengthen other skills, like first aid and eagle eye? What makes magic schools better?

Ideally, many skills need to be adjusted. The question here is whether there is a good mechanic and whether there is a gameplay need.

Specifically, the problem with Tent and Eagle Eye is that they are for mages, and mages are weak on their own, so strengthening Tent/Eagle Eye will hardly change the gameplay. And if that's the case, then there's no point in making changes for the sake of changes. The same applies to most other magical skills.

For example, we quickly agreed on Scout, as this skill is often offered to popular heroes, many have it from the start, so there was a gameplay demand to strengthen it.