Past about seven or eight ships a side, that would become a major load of paperwork. Keeping running tallies for each craft of which phase it was in, how many of it's weapons and turns it had already used- given a normal amount of banter across and confusion around a games table, nobody's going to remember.
It would not be impossible, nor illogical for a system with a lot of complexity in it anyway- Brilliant Lances gave ships with more exotic drives more move phases- but it's more record keeping than a lot of people on the boards, including me, have said they were willing to put up with in the past.