FWIW - the old method was actually deprecated back in 2019 when the CVAD Setup Wizard was added -- this was necessary for DaaS users because the DaaS studio running in the cloud could not communicate with the PVS server. At that time we added the CVAD Setup Wizard to replace that and that remains available today. The "old" studio method was only left in place to support folks running 7.15 PVS (which doesn't have the CVAD Setup Wizard) and was never implemented in webstudio since it couldn't work in DaaS.
The new Webstudio based provisioning is available via the GUI for VMWare and via powershell for VMWare and XenServer (as of 2407CR) with more features being added in every release.
As to AD account management -- with Studio/MCS based provisioning of PVS targets, we are adopting the same identity management as regular MCS VDAs (so an Identity Disk, with computer accounts managed via that) -- this is actually a great benefit because it also brings along all the other identity features previously only available with MCS (like Hybrid AAD, Pure AAD, non-domain joined, Citrix Service Continuity, etc). So the PVS server is no longer involved in AD account management and you use the regular support in studio (like Identity Pools).