You keep mentioning TS%. His entire FG% consists of wide open dunks. Don't make him out to be Curry. He's a liability on offense and his defense isn't good enough to balance it. You think teams aren't going to know how to guard him after seeing the blueprint? He's exposed.
You think they couldn't have seen those same games in the regular season when he was awful against Boston also. It is just plain nonsense.
Because not every team has an athletic big like Horford that can guard all 5 positions, but the championship teams do. The path to get to the finals is through Boston then GSW. Draymond will shut him down as well. He's going to be Russell Westbrook. Pad his stats by abusing small point guards on crappy teams in the regular season and never win a title. This is not an ideal situation for LeBron to go to for his final act. LeBron wants 3 point shooters so that he can go 1 on 1. Him and Ben on the floor at the same time means that he gets doubled on every single offensive possession. He is a liability.
They played the Warriors both times in November. Simmons wasn't great in the 1st game the Sixers lost by 21, but he was pretty dominant in the 2nd game that the Sixers lost by 8, but Simmons was +7 in 38 minutes, shooting 11 of 15 and ending with 23/8/12.
Against the Rockets, both games were in October, Simmons wasn't very good in the first game, but was again dominate in the 2nd game shooting 10 of 15 finishing with 24/7/9, he was +10, the Sixers won by 8.
How about the 4 games against the Raptors. Game 1 in October, he was ok, but the Sixers got rolled by 34 (he was -20 in 33 minutes but finished at 18/10/8). They lost by 5 and got rolled again in December. The closer game, Simmons went for 20/6/4 on 9 of 14, the game they got rolled he wasn't very good just 10/5/6 on 5 of 13 (he was -8 in 33 minutes, the team lost by 16). Sixers won the game in January, Simmons wasn't very good just 12/4/2 on 50%, he was +1 in his 27 minutes (they won by

.
Against the Cavs he got better every single game and in the game that decided the 3 seed, Simmons went for 27 points on 12 of 17 from the field and added 15 rebounds and 13 assists.
He was pretty dominant against the Spurs, Jazz, Wizards, Heat, and most of the other playoff teams. He was ok against some like the Pacers, Bucks, etc.
He struggled with Boston and Toronto, but he struggled with them all year. He did just fine against the 3 other real good teams and was pretty good overall against everyone else. A few matchups caused him problems, but it wasn't like he was just picking on the crappy teams to pad his stats.
And this was not only his first year in the league but his first year playing PG full time.