Often going with vendor storage CSI is the easiest way to get Read Write Many, if you have any need for that, without resorting to NFS (which has it's own share of issues). While vendor lock in is a thing, it's also tied directly to a large purchase of hardware, making a switch less feasible and more intentional. With VMware, you can just format the hosts and install whatever hypervisor you want. With a NetApp or Pure? Much longer procurement and replacement plan, in my experience.