> You’re now so far removed from simple Unix-like principles, tools and platforms that migration will be harder by an order of magnitude

Exactly my experience. Some services I manage are still entrenched in Big Co. Cloud, and it's a hell. This lock-in costs us additional money (thousands per year), but that amount is less than it would cost us to migrate those apps immediately.

Unix is cool not because it's a Unix, but because it's simple, aka Unix Philosophy.