I didn't totally stop watching. Bamba eventually started the games because they preferred Reed's mentality off the bench. The minutes usually still had Reed leading Bamba, despite not starting, so it wasn't as simple as that. Bamba stunk on ice, but if you jettison Reed, it's a bigger hole to fill than Bamba. I think it's very easy to downgrade. I also think that issue was accentuated this season by a flawed supporting cast.
The central disagreement is over this: when Embiid went down. Nothing matters when Embiid goes down. Full on nihilism. We might as well go read Nietzsche instead of watch the Sixers. That's not me saying I want DeAndre Jordan (and yet Denver won with his corpse seeing minutes). Could they have a 3rd center on the roster who is more a traditional big? Sure, matchups vary. But those guys get abused in drop coverage come playoff time, which is all I care about. Again, look at the league as a whole. Having an athletic switchable 5, with good touch, is better than most teams. I don't know who is the archetype, and I don't think it's high up on the concern list.