Yes you can evade in a Paladin everytime you loose your shield, yes you can use a GB to feed him with bots forever.
Yes it's good "RP".
Does it promote "fairplay"? Not much.
Should we all now start to use the most unfair tactics we can find? Would make it lovely really.
Wait, you're arguing against the long-standing and very sensible tactics of b/b-trading and dodging when you're shield is down? I wasn't there, don't know what you're talking about, but if you have a problem with the GB feeding b/b to a fighter, kill the bloody gunboat. If you can't, then you should probably run away.