Yep, that's the key thing. The ERP systems which have their tentacles all over every part of the organization make changing stuff out effectively intractable.
I don't know if it's intentionally like this (by design on the part of the vendors) or if it's just a consequence of people being terrified of change.
But while the 3rd 100million project to rewrite that legacy, proprietary cobolt data app is faltering, the RPA department is actually making it accessible via a rest api that activates a virtual mouse that clicks around and ctr+c,ctr-v the result back to the user.
The curse of building great digital infrastructure in the 80s is you might get stuck with it 40 years later.
Most software products that companies buy have interoperability as either the least prioritized feature or as something to be actively prohibited.
The best, brightest, most modern examples of software, we are not talking about.
Not using RPA is like not using macros in your text editor, because they are automating programmers out of work.
Some data can only be accessed through a legacy gui and it needs to be cross referenced with several proprietary databases that also can only be accessed through a gui.
Even if you begin migrating these it can take years if not decades. Meanwhile shit needs to be done.