Good post. It's just a couple things i personally disagree with...
Instant Vintage commercial sound comment. It was experimental, gospel, neo soul, funk. Saadiq done what the hell he wanted on that album, which is why i love it so dam much. Like you said, he coined it "gospeldelic". You got to think when that album come out the type of R n B that was being dropped. A lot of people thought he would ride the wave of Toni Toni Tone but he didn't.
Also i personally don't agree with saaqiq not being as talented. Dude is the complete musician. D'Angelo's voice is butter of course, better than Saadiqs, and he can also produce and play instruments but Saadiqs on another level in that regard in my opinion. (just seen your other message saying basically the same). Saadiq is hugely respected in the industry but perhaps to the fan you are right.
I've been having these discussions since the 90's
Ultimately, I'm just blessed to have music from both these legends.