"Maybe they need to bring back some ebay managers from retirement to fix this broken platform?"

Or - and I'm half-serious here - they could offer contracts to highly experienced sellers to fix it, a bit like the way some security and anti-virus companies employ former hackers.

I doubt many highly experienced sellers are also highly experienced coders, but that's kind of by-the-by - they would not need to be great coders, they would just need to tell the coders what end results the coders needed to achieve (just as, presumably, eBay management tells then what to do now).

It'll never happen. As with all corporate entities, especially the larger ones, a certain arrogant and intransigent mindset is baked in. They would never seek assistance from its platform users. They know best - after all, if they didn't, how could they have achieved the positions they have?