They were a tough listen then and now. Oliver Lake has however moved on to Trio 3 with Reggie Workman and Andrew Cyrille whose music is a tad bit more accessible if not highly intellectual. Their album with Vijay Iver is both a tour de force and almost too cool for the room. In my opinion all of Iver's stuff is just too cool. He's a real tough listen for me. He thinks and plays compositionally and in broad strokes. It leaves a lot of space for his bandmates.
I recently went to see Ambrose Akinmusire with the Sullivan Fortner Quartet, and although it was accessible let me tell you, it was some high level stuff. I was with a reviewer who works for an online audio equipment magazine and his wife. After the concert she turned to me and said, "The reason why some classical conservatories are lacking in applicants is because so many are now going to jazz conservatories and learning music through the rigors of that academic standard and milieu". These new jazz musicians are well aware of and acquainted with both classical and jazz musics and are equally at home in either genre, frequently combining these musics. Difficult, high level stuff indeed.
I listened to some avant-garde jazz growing up -- Cecil Taylor, Anthony Braxton, and such. I am glad I went to see WSQ, and while it was certainly a learning experience, it's not something I'd do again. It was probably the end of my listening to avant-garde jazz. (I don't recognize any of the names in your second paragraph.) The reactions of the other people I went with ran the gamut from "Best concert ever" to "Four guys playing on a stage ignoring each other." I think I had more of a problem with no rhythm section than I did with the music itself.
Very interesting second paragraph. There was a time when classical players very much looked down upon jazz players. But I think there's been an increasing realization that the best jazz players are both virtuosi AND able to improvise, while most classical players have no ability to improvise at all. I saw a really fantastic documentary on Stephane Grapelli a few years ago. Not too long before they both died, he made some recordings with Yehudi Menuhin. Grapelli was nervous about playing with one of the most revered violin soloists of the 20th century, but did fine in the classical part. But he wasn't half as nervous as Menuhin was when it came to having to play a jazz solo. In the end, he never got it, and had to have a solo written for him.
I think that Benny Goodman also opened a lot of eyes when he played the premiere of Aaron Copland's clarinet concerto.
A good musician, whether it's orchestral, jazz, Irish, rock, country, etc, is still a good musician and deserving of respect.