First Cavs stint LeBron doesn't compare to what he became in the run for his first title with the Heat. Everyone criticizes (rightfully) Kobe for taking every shot and always hogging the ball during his prime, but LeBron always has tried to get his teammates into the game. He had some really crappy teammates in Cleveland still was able to get them to the Finals one season, and if it weren't for Danny Ainge probably would have done it another 1 or 2 times. But he was not afraid to pass and give someone else the shot, even if it defies all logic since he's LeBron f'n James. He became a little more selfish I feel in Miami when he realized he was so much better than Wade and basically took the team over. Nobody else dictated what was going on out there, it was LeBron's team and they all followed his lead. He started taking the big shots. Come back to Cleveland and it's largely the same thing, which is one of many reasons I'm sure Kyrie left. LeBron has always been a guy who wanted to be a team player and wanted to have trust in everyone, but there was a point he definitely came to accept he was that much better than anyone else on his team and needed to play accordingly.
That said LeBron has, and you can't blame him with how much of a foregone conclusion making the playoffs is, taken it easy on a lot of nights against subpar teams. He still goes all out in some regular season games against fellow contenders but he will conserve himself against the Orlando Magics of the world, and you can't blame him. Warriors grinded hard for 73 wins instead of taking it easy and they came up against a fresher Cavs team who just wore them down on defense.
My big point was that because LeBron does take it easy on the defensive side in a lot of regular season games is what is used to penalize him the most by MVP voters.