Is it difficult to migrate to other distros in your case? I would argue the binaries should be similar…
They used 30 years the same Windows version. So maybe they can use 30 years the same Linux version. I don't know. All I know is, choosing Linux is the opposite of choosing stability.
I would argue that a close-source (at least before the leak), non-supported kernel is way more unstable and risky than an open-source, still maintained one (some kernels are actively maintained through 2033).
Bear in mind that the position was not about developing/maintaining the OS, but the applications that run on it.