First, what constitutes a significant margin?
Second, I can't say I'm in love with the "spacing" argument. I think ball movement tends to take care of such things just as well.
Also, this for me is more of a "someone said it" and it now it's some kind of skill. Let's just call it intangibles or something. Everyone loves those.
Anyway, I went to the trouble once of highlighting when Goodine was in, and at no point was unguarded, so I just don't see it as some monumental advantage.
It certainly exists to some extent as an advantage. When he's on fire, as he's been quite often, it creates a lot of a havoc for a defense, but overall through the course of entire season - I would say it's rather slight IMO.
Intangibles!
Third, I would argue all day that on some level, an Eli Hughes shooting 35% from three, is vastly more impressive than Buddy shooting 38%.
You can tell me Dāvis Bertāns is just as good a three point shooter as Steph Curry, but that's rather irrelevant to me. Curry has a much higher level of difficulty on his shots, and creates those shots for himself quite often as well. So, perhaps Bertāns shoots better one season, maybe two, maybe forever, who knows...still won't matter to me. He's not as valuable a shooter, because, well, the defense can turn that faucet off.