I've watched plenty of boxing and plenty of Mayweather fights (mostly boring). I enjoyed the fight honestly and glad it was competitive, but I have serious doubts that Mayweather didn't carry him. In the beginning I thought maybe Mayweather is being careful as McGregor is bigger, younger, etc even though Mayweather is miles away from him on boxing scale level/ IQ. Maybe let him wear down even. After a few rounds it appeared to me that Mayweather was putting on a good exhibition.
Even if you want to say Mayweather didn't carry him, he was also 40, smaller, doesn't hit hard, etc. McGregor fought his best, but fact is he doesn't belong in there with elite any young guys (canelo, spence, crawford, etc) nor does he belong in the ring with Pac. Those guys are aggressive (if it's an up and up fight) and they hit very hard. McGregor could probably do alright on a lower level, 4-6 round fights, etc, but he's not going to start from scratch of course.