You are wrong about everything. Its not about services, Everything happens in kernel level. Vmware workstation is completely different. Let me explain:
HyperV is Type1 Visor. That means that your pc runs a layer of Kernel that handles virtualization and then as a second Kernel the Windows 10 Host OS, and gives direct access to all resources. This consumes resources because EVERY resource goes through more processing, and because those systems wasn't optimized for gaming performance. When you run a VM, the primary kernel(Hyperv kernel) creates a new "container" that runs the Guest OS Kernel on top of it, like Host Kernel but with limitations and not direct access to resources.
On the other hand, VMWare workstation,VirtualBox is Type2 Visor, that runs onTop of Host PC Kernel. This type of visor does not affect host pc performance when vm are not running because everything is being handled by your host Windows Kernel.
In normal conditions, while gaming, all resources travel through hardware to Windows Kernel and then distributed when needed. When you enable HyperVisor, all those resources travel through hardware, then to the HyperVisor, and then to the Host PC that its been treated as Virtual. And this middle layer as i specified above, is not optimized and will not be optimized for gaming performance because its optimized for server usage as failover, clustering, etc.
So YES it will affect gaming performance no matter what, no matter the hardware even if you have a core i2000 and rtx5080, it will affect them! Benchmarks may not show this kind of affection but real world usage will.
You don't have to install a type1 visor to your main gaming pc, when you can opt in for Vmware Workstation(i know that its not free). Every kind of visor is optimized for different workloads, and thats why HyperVisor is only available to Pro, Enterprise windows 10 users and Windows Server.
If you have another question related to virtualization, you can ask me. I hope i covered you with the best way possible.