(A) Selenium's UX isn't nearly where it needs to be to upskill an analyst to create their own automations.

(B) Selenium's Windows app compatibility is haphazard.

(C) Selenium doesn't have the kind of corporate support it would take to expand compatibility quickly enough to catch up with its competition.

The RPA space is the Linux desktop problem in a nutshell. Polish and niche compatibility are the final 10%.

Nobody on the open source side has the interest in making a VB6 app work. And nobody on the corporate side really wants to use it for more than what they're currently using it for.

I can't overstate the sheer number of bizarre situations a tool needs to be able to handle to be effective here.

Because being able to automate something 95% of the way to completion is usually a lot less valuable than 100% (note: talking about percentage of happy-path process, not of total incoming workload here).