Totally get it. Not pushing you against the GP100. Just by question, it seemed like you might be reading about strengths and "built like a tank" comments that aren't reality.
If you have the 586, you know all about what the 686 brings. Lucky you for the pretty 586, but you're right. The stainless 686 or GP100 are just easier to manage as an owner.
Here is (one) rim binding issue of the GP100 on the ruger forum:
https://www.rugerforum.net/threads/...0-7-shot-binding-issue-is-fixed.376041/page-2
Despite what everyone says, the GP100 only has a 3rd lock up point over the 686. I believe that the GP100 1771 and 1773 models prove a point that has always been true: the 688 frame, cylinder, and cylinder window are larger while the guns are nearly the same size. Ie, I think it proves the forged 686 frame is the better of the two. It does size better while there is no difference in shooting out of time. The 686 top strap and forcing cone are not a problem, therefore the GP100 can't be strength superior. There just isn't anything to it.
The GP100 (all Rugers with a transfer bar) also has that additional problem. Not discuss much, but the GP100 transfer bar CAN beat itself to death if it is out of sync. Google it a bit. Not common, but also it is a real thing.
Good luck. With current prices, 686. Hands down. Not even a question by a small amount. The GP100 1773 is actually more pricey right now than a 686 6". The 6" are always less desirable and typically are cheaper for it. So you know the market is off right now for buying. A GP100, in 10 years prior to covid, never once was priced more than the exact same set up 686. Ever.