I get that you’re likely exaggerating by saying “it’s no extra work”, but managing another account is markedly extra work. It will also cost extra because Cloudflare does not add any markup for registration, which is why they are the cheapest registrar.
I think the convenience and reduction of cost greatly outweighs the highly unlikely situation where “something goes fucky”. If it does, then what? You can’t make DNS updates for a little while?
The most likely reason to get locked out is billing issues, or maybe you lost your login information or something like that, which is going to be the same risk regardless of who your registrar is. Otherwise you’d have to be involved in some sort of legal issue associated with your domain and that is a much deeper issue than can be solved by simply changing nameservers.
Came here to toss in this suggestion, too.