It is enough that almost all devices around me have a bunch of running code that I have absolutely no control over. I need at least one computer I can trust to do MY bidding.
If you look at FreeBSD, the majority of third-party modules are free software. It's stuff like graphics drivers, newer ZFS modules, esoteric HBAs etc. Proprietary modules, like nVidia's graphics driver, are the minority.
I can see and understand why things are the way they are, and indeed I agreed with the approach for many years. Today, I see it being as short sighted as the GCC vs LLVM approach to modular architecture.
Linux is nearly 30 years old now. To not have stable internal interfaces seems to me to be indicative of either bad initial design or ill discipline on the part of its maintainers. Every other major kernel seems to manage to have a stable ABI for third-party functionality, and Linux is an outlier in its approach. Having to upgrade the kernel for a new GPU driver is painful. Not only do I have to wait for a new kernel release, I have to hope that none of the other changes in that release cause breakage or change the behaviour in unexpected ways. Upgrading a third-party module is much less risky.
Having a stable ABI for two years is vastly easier to support than an ABI which changes every two weeks. This is reflected by the number of binary modules which are packaged for FreeBSD in the ports tree, and provided by third-party vendors. This stability makes it possible to properly support for a reasonable timeframe, and vendors are doing so.