It's a general psychological problem, too. A huge part of storage organization psychology, whether in software or in a physical room, is subjective/proprietary perception and judgment. People who prefer and naturally warp any job role or position to use these tools, as all humans do with subjectively preferred processes and perspectives, will never stop creating them.

The good part of this not-invented-here mindset is that it's also how technology moves forward. "I need this new system to be mine/fit my way of organizing" is also often another way of creating a "this never existed before" product or outcome.

These storage and organization tools and silos are born as subjective (context-fitting) design processes. So they tend to get locked up behind depth-oriented (subjective) processes, and eventually frozen by stabilizer groups.

Stabilizer groups follow up to use the tools and promote the idea of keeping the data siloed the way it is. They don't like change at work because change breaks their preferred psychological processes, causes them to have to re-build their perceptual frameworks, and because they're humans, this makes them do stupid things at work, like lash out or become passive-aggressive or detonate their new diet plan or become late for a baseball game. They will blame all of this on "open data" or whatever it is that caused their stable workflow to destabilize.

There are lots of solutions to this, and Excel by itself can be seen as an attempt at a solution to the problem...also the problem can be moderated by the system of energy surrounding the data valuation and access to the data.

And "just don't silo stuff, guys" seems to be the proposal with the worst track record so far.