And if you have a large company and many teams, you think actions will help? (Aside from the UI issues you mention). Rebuilding the Jenkins from scratch now would probably get rid of most of your problems, but in a year is gonna be a mess. It's similar to how it's going to go with and CI.

Also, a good DevOps person or team will keep the Devs happy (or at least, not very unhappy) with any tool, a bad one will suck anyhow.

At least that's my experience.