Jump is broken but not because it is a bonus action or because you can magically jump really far. (...) Dipping is not a big issue for now because I don't use it but what will happen at higher difficulty levels ?
Yes, jump can extend you movement by a decent amount, I don't think it is that bad - dash will still move you further and I find situations in which I don't need or wouldn't benefit from jump to be common enough, for the jump boost to become dominant strategy.
I have quite a different experience than you then. Better use jump + speed + action than wasting your entire action (and eventually extra attack) for dash. The arena are not really large and the difference between dash (action + speed) and jump (bonus action + speed) is not often really worth it.
I mostly NEVER use dash but I feel the need to spend my bonus action with jump very often just to benefit the extended movement. Jumping to extend your movement is a very optimal action if you don't have something specific to do with your bonus action. Which may happen quite often at the beginning of combats depending your class/subclass.
