I don't necessarily disagree with this general outlook, although your previous post suggesting Nadal was nothing special in 2008 is a bit over the top, but hey, we all have sour grapes over specific losses so I get it (not being a dick here, I'm serious). What I found genuinely interesting is a previous claim you made that Roger "underachieved" at Wimbledon. To me this is very tricky, somewhat harsh, but potentially true.
To be fair though, this is not a team sport, so while I get the comparisons to Jordan's 6-0 final record and all, it's obviously not the same since one off day, or hell, one off set and you could lose, especially on grass (I get you were talking about the mystique of being undefeated in the finals in general, and not comparing tennis to basketball).
But it's funny, I actually think where Roger underachieved at Wimbledon is not in the finals he lost. Nadal was in better form in 2008 and in his head, and while you could argue for that match, I can just as easily argue about how Roger "should" have lost the previous year's final... and I think Novak was a better player in 2014 and 2015. So of those 3 finals, I guess when you combine the chances he had in all of them you could say he should have won at least one more Wimbledon title.
But I'm of the opinion that, mystique of being undefeated in finals aside, it's probably better to lose to a Nadal or Djokovic in the final, than lose to Berdych, Tsonga (after being up 2 sets to love) Stakhovsky, or Raonic. Those are the losses Roger should have an issue with at Wimbledon, and in that sense, yes, you could argue there were years where he certainly underachieved.