There's a happy median between long fins and excessive finnage on long finned fish IMO. That's why I won't breed a fish that is hampered by its fins. All of my long fined fish have no trouble swimming around, even in a current. That is because they are WELL bred, WELL fed, and WELL cared for. That's the difference between long fins and this. Long fins can still lead very normal lives in even large tanks. Too big pectorals is bad for business.
Instead of making the pectorals larger breeders should work towards making them colored. Half the attraction to these new pectorals is they're colorful.