Then you don't have to waste money/materials making other sets first, before migrating to berserkers.
I don't necessarily agree with the fact that berserkers will teach you how to dodge. I think it rewards people who CAN dodge. I automatically assume that new players can't dodge, so I suggest armor which is more forgiving. Knights isn't a completely sunk cost, either. I will occasionally switch to it if I have to run a meta build for pugs.With all the bank/bag space you get in GW2, extra armor and weapon sets only help you!
Most of the guilds I have encountered (mine included) do not mind if a new guardian is using a set of knights, as they will be going on planned runs with an experienced group.