Sure, but they are there for the /big/ problems. The myriad of small real-life problems that sometimes are solved by an intern with Excel and VBA are way too small to get handed to the professionals. Those things that would cost just 2 developer days are never handled (because the dev org doesn't keep a bench of developers sitting around for these small one-off tasks and thinks in multi-year projects).
Why would you assume this? The company that I work for (~ 1000 employees) has one part time employee who manages sharepoint. Any new software we wanted had to go through the procurement pipeline before we discovered we could use powerapps without asking anybody's permission.