Couple of things, with regards to Jaco being a "soloing bassist" and not playing for the song.... He was actually one of the most supportive players out there, especially with Joni..... And James Jamersons lines being written for him...? Thats not actually true, a chord or lead sheet yes, but that was it. The lines for Reach out, and many many more, are on record (no pun intended) as being improvised. Theres plenty of documented evidence and first hand accounts to support this. "No love for Jaco".
Each to their own, now I think I'll go start a thread about a player I'm not fussed on..... ???