Think about it this way. No matter how much PvE dmg you're going to suggest it for the donor mg/mgx2, it's never going to be fair for those who earn their well-deserved mg/mgx2 through hours of grinding. Players who just started questing will already have a decent start with PvE weapons compared to those who played at starting point.
Of course, donor PvE mg/mgx2 sound nice, even I want an upgrade from my current mgx2, but why wouldn't I recommend it? The reason is very simple. Having donor mg/mgx2 simply destroy the fun, defeats the purpose of grinding so hard for your mg/mgx2, cut off the excitement you get when you realize that you have just picked up a red tagged mg/mgx2. Could probably list down a few more.
With the current daily reward system, everyone could've easily gotten themselves a decent PvE mg/mgx2 coins.