Is this am issue or am I crazy?

I'm working on a client site and I noticed a small issue with their url categorization. They have two different category types and this impacts the URL structure. The categories are city and service. Example: /austin/plumber/ The issue is that the main city page, with no service, is /austin/all/ And the page /austin/ is a 404 error. There are no links that to /austin/ internally or externally. But I believe they should 301 redirect /austin/ to /austin/all/ I know the Google crawler should be smart enough to not go to /austin/ since there are no links that take you there. However, it's possible that crawlers can assume that the /austin/ page should exist. Fom a user experience perspective, if a user were to try to delete the /plumber/ slug to go to the main /austin/ page, they'd be annoyed to see a 404 instead of the Austin page. Fixing this would be a low priority, but is it worth fixing at all for a crawl budget or even user experience point of view? Or am I wasting time on something that doesn't matter?