It's actually much more because the DSLR companies, for the most part, are technologically-backwards, and don't get things like platforms, APIs, or similar. It's nineties-style closed thinking. It's a big part of why cell phones are now eating their lunch. I used to be a pretty serious photographer, and own probably $10,000 worth of camera equipment.

I mostly shoot with my cell phone these days, not because I mind spending money on cameras, but because it's a better device for most photography. It integrates with the world. Cameras integrate with their manufacturer's closed ecosystems.