Amen - so much illogical moaning about it.
OK so in the later circles, both of you have cover. New circle appears, you are forced into an open field and your opponent has a tree to hide behind. Your opponent can take engagements at will and also heal at will all the while having 100% visibility of you. In first person you will of course still be at disadvantage but you will have a much higher chance of re-positioning as your opponent's vision now has a big blind spot.
Still fair?