Please let the plugin delete users who ended their subscription

I would love to have a better overview in the backend.
Would be nice if the plugin deletes the WP User created for the patreon user, after the user ended their subscription.

also would be nice to have a row inside WP for their users with their current tier

There may be users who already had a long-standing WP account at your site before they connected their Patreon to it as a patron, so such an option is not easy to implement. But generally its not a bad idea.

my problem is, that I cannot see in Wordpress if the User is a current Patreon subscriber.

I get your point, but woulnd’t fix a clear taxonomy for the naming fix that?
That users which are generated by the plugin getting an obvious naming scheme?

You dont need to disable access for a former patron. The plugin will deny access if a patron or former patron does not qualify for accessing a post.

That users which are generated by the plugin getting an obvious naming scheme?

All WP accounts created for patrons who did not already have a WP account have the patreon_XXXXXX username format.