If you care about primary professions then you'll lose the 10 free lvl 600 professions by leveling from level 1 instead of level 60, but other than that it would be fine. But remember, you can level from 1 to 60 with RaF in a couple of hours, so if you waited just a very short period of time you could also have the level 90 team and 10 fully leveled primary professions.