You are reaching bud. For one, you have to buy an extra 3rd party device. By that logic the PS4 is portable due to remote play.
But lets just give credit to table top mode here...you are still not using it as a portable. The device is stationary and cannot be used on the go. It is no different than bringing your PS4 and X1 with you and plugging it into a small TV. The only difference is that the Switch makes it easier.
So no, you cannot play Super Mario Party in handheld mode. However there are no handheld games that cannot be played docked. This is because the Switch is a home console designed as a hybrid to allow you to take most games with you on the go.
iirc VOEZ needs the Touchscreen, and several Labo variations cannot be played docked.
On the other hand, playing games like Super Mario Party or Just Dance undocked, while in theory possible, is wildly unpractical.
So yeah, it is a true hybrid as games need both possibilities, docked and undocked play
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/