This is not factually correct - please see my comments on the rpietila thread.
The two coins are *surprisingly* similar in the %age of coins mined during the time someone had an advantaged miner. If anything, XMR is actually just slightly worse, because it has a faster emission curve and therefore a few more coins were mined during the time. (Remember that XMR's curve is twice as fast as BBR's.)
This is a perception problem used by people to bash on BBR, not a reality problem.
The could be only perception, but I'm not sure. It seems a lot of non-advantaged people reported being able to successfully mine XMR and stuck with it, while a lot of BBR miners tended to complain and give up. I have no objective information about the magnitude of these, I'm just going by what I saw on the threads, IRC, etc.
Maybe that is just because the XMR price was going up, lifting all the boats so to speak, I really don't know the history of the price curves of the coins though. I remember BBR have a run up too. If so that would have affected both coins equally.
Perhaps having pools earlier helped XMR. (Is this even true? I'm not sure.) Small miners were able to get something even if they couldn't quite compete on equal footing. Or maybe the faster XMR curve meant there were more coins to go around (that's not entirely rational of course, but people aren't either).
I do think that early coin adoption is rather critical and fragile, and that optimizing miners who come along and "rape" a coin (whether or not associated with the developer) can do a lot of damage. I don't think they owe the coin anything, so there is nothing immoral about this, but people doing it have to decide if they want to help the coin or maximize mining profits. That's an individual decision. Coin developers who don't want to be in this position need to ensure that easy/early optimziations aren't possible. Both BBR and XMR failed on this (as do almost every coin that comes up with some new PoW although most of them are probably actual developer instamine-type scams).
I hope this doesn't come off as bashing becuase that is not my intent at all, I'm just trying to interpret what I saw happening in the past.