> You could argue that The Don in charge of the US is in control of letsencrypt

He's not in control of letsencrypt or any other US-based CA.

It may not be well known, but Trump's administration loses about 80% of the time when they've been sued by companies, cities and states.

There's much more risk of state-sponsored cyber attacks against US companies.

Yeah, it's a bit far fetched but after Cloudflare CEO basically threatening to cut off Italy I was wondering what would happen if US really invades Greenland.

A simple windows to linux migration is not enough. If certificates expire without a way to refresh you'd either need to manually touch every machine to swap root certificates or have some of other contingency plan.