Because as I said this is a roleplay the masters would be superfluous characters and may as well be brain dead like Shirou's masters if they're not used. The enemy has masters who will also be engaging in combat not unlike Anderson. Leave it at that because that's the fact of the matter it is so the masters don't just become pointless mana sticks.

As I have said multiple times at this point she is not going to be crippled, or severely hindered. However Caster will effect her in some ways, and the other masters, and servants won't always be near Atlanta. I hope this ends the discussion.