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 don't see dip becoming any bigger. It's damage shouldn't scale while other damage and HP will. Sure it's extra damage so its always better to have, especially if you can dip before engagement, but I don't think it will have a major impact.
