I think you're wrong, with a caveat: the modern game favors a team that shoots a lot of threes, and guards are generally better at shooting threes than centers. Also, complementary players for a dominant big man appear to be harder to find nowadays.
It may be easier to build a team around the strengths of an elite guard than to do so around the strengths of an elite center, but I utterly dispute the notion that a guard can lead a team to more wins.
I think it's harder to build around a big like Cousins. He's amazingly talented, but he's very ball dominant. To put things into perspective, Cuz's lowest usage came in his rookie year at 27%. Tim Duncan's career usage is 27%. On top of his ball dominance, he's mostly been an isolation player who doesn't move well off-ball in an offense. Cuz is athletic, but unlike traditional PFs and Cs, he can't play above the rim at all. He also, strangely, struggles a little bit in PnR, PnP, etc. He's a heavy scorer, but not the most efficient. In a Cousins-type offense, you
really need to run the offense through him to get the most out of Cuz has evolved his game throughout the years to fit into modern NBA, but the above still remains true.
I don't think it's necessarily hard to build around a center, but I think it's harder to build around Cousins. He's such a unique player, and it does hurt him sometimes.
Cuz has the usage of a PG, but he's a C. Problems usually come up when that happens.