Actually, he isnt a PG anymore. He has spent less than 4% of his time as PG in the last 3 seasons (although he does get about 7 APG, which is very good for an off guard). He is really just a scorer now, and his abilitiesi n this area are in decline. He cant shoot 3pts still (he has gotten better than his Sixer days before, but he is still around 32-35%% which is fairly bad) and his 2 pt PCT has been in decline for a few years.
At $25M/Season Charlotte have basically a zero net value player on their hands (i.e he isnt worth his salary), and they would love to include him in a trade and have someone take his salary off their hands.
Ben is a better point guard, by alot. Holiday wouldnt help our need for outside shooting (he is below average 3pt shooter), so basically he would be a short SG who would have the same offensive profile as Simmons, just not as good.
Yes, the problem is that they dont really have anything more. They would be including last years 1st rounder, this years, another one and one of their top scorers. I can't imagine they would throw much more into the pile unless Jordan is willing to come back and play 10 minutes a game for us to show these guys how to win.
I am not saying we should never trade Ben or Embiid, I just dont think Charlotte is a particularly good trading partner. I would rather keep the two guys, but if Doc decides one needs to go I would look at other teams that have more top end talent to throw into the kitty.