Fair point.
I guess you have to think about the 'playability' aspect too though. If it became so difficult to pin/hold someone, no-one would bother trying.
I reckon it is not too difficult to overpower/restain someone 1 v 1 when you have a str/size advantage in normal circs. In a scenario where the opponent is big and 'handy', combined with 'adrenalin rushed' and possibly drink/drugs...then maybe the GM needs to throw in a few additional modifiers to the rules
