Ok, the main point of his advantages are this:
-he had an old school style, this means his stance is based on his head off the centre line, blading his body to minimize the opponents target area, if you want to punch his face you need to past his lead shoulder first.
-he has an outsantding sense of distance, so he knows when he is in range to punch his opponenet and when he is in range to be punched by his oppoenent.
-he uses angles in offense and defense, this means he can attack from certain sides and escape for other, also in defense he can move to other side of the opponent. (he never stays in front of his opponent in a static stance)
-pro active defense, see when he throws a right hand he almost does the motion of ducking the left hook after throwing the right hand, this decreases the chances of getting caught by a punch after he punches.
-handspeed, he has an amazing handspeed combine this with the previous pints and he becomes pretty hard to fight. Almost every fighter with fast hands lacks some of the previous pints because they fall in love with the speed it happens the sames to power punchers.
-Great defense, along with pro active defense he knows how to respond different situations when in defense so he is almost safe in most ocassions.
-then the part that i dont like about him, minimized the risks of the opposition he was facing, be it ring size, glove size, etc. so he always looked for an advantage, also the fact that he waited in some cases to the opposition to fade taking into account that his style loses less when older that other styles.
And the final one but that doesnt goes directly to mayweathers account, modern boxers focuses more on athleticism than technique, with a few exceptions, boxing teachers are a rare breed tha apex of the sport in a technical standpoint was in the mid 30s to mid 50s to slowly decline the next years, also the am. got fucked by awarding volume punching over effective boxing.
i think this are the main