I’ve some customers who are using the local Administrator@vsphere for different things like Backup-User, or Reporting things. From my point of view I can’t recommended this and say please create Service-Users for all different topics. Like one user for Backup – in my example something like: _svc_veeam_bck or for Horizon _svc_vdi. Give the local Administrator a good and secure Password, write it down, put it in Keepass or something else and use it only when it’s really needed! This is your last resort to login to your vCenter.
What do you think about using the Administrator@vsphere User?