They are okay, provision really fast, decent Terraform provider and are very cheap. They are fairly reliable, but I've always been a bigger fan of DO and Vultr. You get what you pay for in the long run.
I'm not sure why you're getting down voted, you're right. I'm not sure if anyone would run Proxmox for their enterprise hypervisor? I mean HyperV is okay. Slim pickings for big orgs. I know there's Nutanix, but most folks are moving to the big three for VMs and hosting.
It's really sad, they used to be amazing and the goto for running Linux VMs on back in the day. Still haven't seen anyone do hardware pass through as well.
There are some folks that know both how to run a business well and are passionate about the technology, but they are rare unfortunately. More common in smaller organizations at least.
I say it all the time, people care about apps and browsing websites, they don't care about the how, just the what. Too many techy folks cannot see it as a business and human problem.
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Hibernation I've found handy on my laptop, but I wish there was like a fastboot option with Ubuntu. I know windows 11 does it to boot faster.