I've seen several companies build a Slack bot as a sort of "command line" like internal tooling system. We did this at my previous company. Like you said, it's

I've seen several companies build a Slack bot as a sort of "command line" like internal tooling system. We did this at my previous company. Like you said, it's easy for a backend dev to spin up Slack (text)-based internal tools easily. It works pretty well for many use cases, though it is suboptimal for things that really do require a UI (eg an internal tool that needs to display graphs). After I left my previous company, I created a SaaS (https://www.airplane.dev/ https://www.airplane.dev/) that makes creating these kinds of internal tools pretty easily. If you write pure backend code/Python scripts/SQL/etc, Airplane will auto-generate the corresponding UI and also allow execution through a Slack bot.