In my opinion, licensing was the hardest part of a Microsoft-based VDI solution and is one of the reasons why it was not widely adopted in the past. However, the rules have changed with things like VDA. With the built-in benefits that come with SA and CSL, it's pretty straightforward to implement a BYOD strategy. There is still a lot of confusion, doubt, and restrictions when using a third party to host VDI, but this is the fastest changing part of IT, with new updates typically coming out every month, meaning that new possibilities may emerge that will completely change the rules. So it's even more important to be up to date, especially as Desktop as a Service is now the hot topic across the industry and not just with Microsoft.