The FC multipathing was a learning experience and the manual workload placement requires good metrics on your workloads. The built-in ceph is decently configured and more performant than FC if you have 100GBS mellanox NICs and adequate quantity of ram. Veeam integration is serviceable but it's not as mature and polished as the integration available on vmware.

Having tried azure local before (it seems magical but the more you use it the worst it gets, update failed for no apparent reason on only some supposedlyidentical nodes, the sdn was atrocious to deploy and was manageable from wac only), I would recommend proxmox over it anyday.

If you don't have linux expertise on hand and have traditional FC based storage, I would recommend something else, probably nutanix if your budget is big enough.