I think you were a bit optimistic about how many assets Philly is willing to give up to get rid of his contract. I can see them using mediocre pick (s) and maybe one decent player (not this year, but probably next). Overpaid players are really hard to move with 3 years left on their contracts (Kevin Love says hi) because the price of doing so is pretty high. It's way more likely to move a contract with 2/1 years left. Basically, Philly shoot themselves on the foot. We disagree on how desperate they are and how many assets they are willing to give up. Although crazier things have happened (I didn't think CP3 could be moved but he had an esplendid year).
It wasn't only the matchup. He looked slow and out of place, even when guarding the paint. Of course I don't expect Mike to shoot 50% from 3. But I think his horrendous start of the season hides the fact that he played well since February (so it not 5-10 games as you say): since the All-Star break he averaged 16PPG on 44% shooting, 40% from 3 and TS%.593, which is very decent. That's not counting the playoffs, where his numbers jumped to 20PPG on much better shooting. He was good making plays for others (using APG under Quin's system is wrong). I understand his play at the beginning was terrible, but I'm also wondering if the narrative (and expectations) would be different If we hadn't given up so many assets for him or if he wasn't so vastly overpaid.
On the other hand, you are making a big mistake in using TS%. For what is worth, it says more about Al mediocre season than Conley. TS% tend to work in favor of bigs, players who get to the line and elite shooters. Of the top 20, only 5 are wings (as I said elite shooters like Robinson, Harden, JJ, Seth Curry) and one is a point guard PG (Dame). Look at the top of the list, it's all centers and some power forwards.