I use it all the time. It's a huge improvement over NFSv3 for many reasons (performance, network ports, locking, ACLs, ...). All the operating systems I names

I use it all the time. It's a huge improvement over NFSv3 for many reasons (performance, network ports, locking, ACLs, ...). All the operating systems I names have fully implemented and mature NFSv4 stacks. Definitely not a MVP to tick a box.