They have to justify the extra price somehow... I don't blame them too much, odds are you are a "pro" user if you want/need Hyper-V. I really like Hyper-V (except the network weirdness no occasion).
If only they'd add GPU passthrough on non server Windows editions...
At the very least make it a pro feature.
Because it breaks other VMs - Vmware, Virtualbox, Intel Haxm. They don't work if Hyper-V is enabled.