Also, to me anyway, "Smile" vs. "Love You/Adult Child" vs. the "Cocaine" tape vs. the Paley sessions are four very different things, so I can't see any Brian project where his "artistic side" is being pushed as being evocative of any or *all* of those other projects.
For Smile, Van Dyke Parks encouraged Brian Wilson to make music that didn't sound like Top 40, and prioritized substance over commerce.
For Love You, Earle Mankey encouraged Brian Wilson to make music that didn't sound like Top 40, and prioritized substance over commerce.
For the Cocaine sessions, Dennis Wilson encouraged Brian Wilson to make music that didn't sound like Top 40, and prioritized substance over commerce.
For the Paley sessions, Andy Paley encouraged Brian Wilson to make music that didn't sound like Top 40, and prioritized substance over commerce.
Those are tenuous comparisons at best, in my opinion. Facilitating Brian (e.g. a good supportive engineer) isn't the same as encouraging him or being a driving force. Those people all played varying important roles, but they are not particularly analogous to me, beyond a lot of us liking most or all of the material that was produced during those timeframes.
I'd hardly say the specific "Cocaine Tape" is strong evidence of Dennis at that moment in time driving Brian to make non-commercial music, yet music that they were looking to actually release. I'm not trying to criticize Dennis or Brian in this regard. But that tape is some zonked out (and/or bored and/or unfocused) guys noodling around. If we could have removed the possibility of anyone OD'ing, does anyone think Dennis and Brian with no other outside input or help would have fostered that music to full, completed compositions let alone a full, completed album? They couldn't even often get into the studio to lay the stuff down so it could be included on archival releases decades later (though as we know they did on at least a few occasions try and were stifled; I'm sure they would have done some interesting things in the studio if allowed, but I don't think a full completed album would have resulted).
Again, I love all of this material. I think "Oh Lord" as both composition and performance on the "Cocaine" tape is a strangely but powerfully moving piece, especially in light of the condition Brian was in at that time. It deserves a thoughtfully-placed inclusion on some BB or Brian release, thought that's extremely unlikely to happen.
But again, these projects did not all have the same exact "not top 40/substance over commerce" driving force and motivation. They were all variations of some similar themes, but not analogous to me too much.