I bought my first VMware license in 2006, and have had an active license / subscription ever since. Until vSphere 7 (which has been nothing but trouble) I was a solid NPS 10. My largest cluster was something like 45 nodes when I left in 2019, many hundreds of VMs rotating in and out.
However a couple weeks ago I installed proxmox on my dev (old) cluster and I'm really impressed, definitely has given me motivation to do some bigger tests before we renew production vSphere in January. Just wanted to leave a note for other folks to consider.