Do you also have a question other than only a remark? Things you are misssing are better reported to the Magix/Vegas makers by a support request than on this userforum .
As it's about 50 years since I studied Deutsch and "eierlegende Wollmilchsau" never came up then anyway AFAICR, I needed to look up that phrase. Not much to my surprise it seems to mean "all-in-one device suitable for every purpose".
There are lots of creative tools in Movie Studio to gain tons of creative tasks. But there is no NLE available which offers everything. As 3Point mentioned above there are several ways to achieve perspective frame adjustments in Movie Studio even if there is no corner pinning build-in. If the Deform FX doesn't serve your needs, try the Ignite Express Corner Pinning (which actually is called "Bezier Warp" and "Quad Warp" in Ignite) which is a free plug-in. That's what plug-in interfaces are made for.
I don't like people with a negative attitude. Just tell your problem and you will get a solution from the experienced users here. Keep in mind, they don't get paid for doing this, so at least a "thank you" from your side would be appreciated.
I've tried the Ignite Express "Quad Warp" but it has limitations. If you move a corner outwards you lose sight of the pin point, and with VMS you cannot zoom out your preview image within its window to try and find it. Also I wasn't impressed with the render quality compared to using VMS's own Deform FX along with Pan/Crop.
I wish VMS had the equivalent of the "3D Distortion FX" found in Magix Movie Edit Pro Plus.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. G.B. Shaw