Question

This can be done, but I would consider Balrog and any other future skill-restricting bosses before doing that. In reality, the skills you would get in place of those would be Iron Body and MP Recovery, both of which are less useful that the rest. However, if no higher skill-restricting bosses are added, Brandish could completely be skipped. I myself won't be taking that chance, but you on the other hand may not want to fight Balrog or any boss of that sort. It's how you want to play your character.

True, if there exists any new pqs that restrict skills to only certain skills then we should keep them. However, with the new restructuring patch kicking in soon, its pretty much telling people you can get another free sp reset again otherwise how are you going to add your sp into new skills like phantom blow for DBs, or combo recharge, combo judgment and so on for Arans? There isn't any that exists and they're still trying to change jobs so before we actually need those early job skills, we'll actually know about it. Other than balrog pq, thats the only time you would actually need those first job skills. In my case, I'll drop ground smash or slash blast to max powerstrike easily anyways, if I ever do need it for some reason because the range of those skills make them next to completely useless for me. Reason why I chose powerstrike in my post is because, without a doubt you won't use that skill ever again for training or bossing in the future besides balrog PQ.