VDI 1.0 is operationally complex and slow to deploy
The VDI 1.0 workload broke the legacy data center.
A legacy data center (servers, storage, and networks) was optimized for server workloads – tens to hundreds of VMs with 80% reads. VDI workload can easily have thousands of VMs with 80% writes to disk.
To unbreak the data center, VDI 1.0 solutions like Citrix XenDesktop and VMware Horizon were built to work around the problems created by desktop workloads. VDI 1.0 introduced a complex mash of brokers, layers of new niche technologies, databases, portals, servers, load balancing, and licenses. The sheer number of components required months of sizing hardware, installing, testing, deploying, and patching. It required constant oversight by a trained squad of VDI specialists relying on a patchwork of expensive tools hoping to maintain uptime and deliver performance for VDI.
In other words: VDI 1.0 is complex.