Earlier quoted context omitted.
Sounds like your experience mostly revolves around older self-hosted JIRA versions? The UX on modern JIRA has been fine for years, and the options and forms are easy to use. Granted, you can add useless restrictions and weird field configurations, but if someone configures it until it's broken, that would be on them, not really on the product.
This is so divorced from my experience. The only Jira setups I have been with that worked were ones where we were actively diminishing its use in the company. Small companies where only a small(er) unit of people use Jira (cloud) is fine, large teams, large workflows, selfhosted or cloud: doesn’t matter. It was always terrible. We actively discriminate against Jira in our company at the moment, and for us it works pr…
We do have all product owners meet up at least once each month and the project collaboration methods are often on the agenda to make sure we don't end up with too many different workflows that are essentially duplicates of each other. Besides the workflows (mostly oriented around kanban boards and backlogs) we just make sure that collaboration across teams use compatible workflows and epics so you don't have to copy-paste information and instead just share stuff.
Each individual team is no larger than 8 people, most are smaller.