The Switch is a handheld, pure and simple.
It looks like a handheld, performs like a handheld, has handheld components (ARM SoC, battery, display, wifi etc') and has hand-held only variants without any HDMI output over USB C.
The Switch is a handheld that can output games to a TV, which is literally no different to Tablets, Laptops, Phones and even devices like the PSP, Sega Nomad.
If the Switch is a Hybrid, then so is the WiiU and so are all the other devices listed above... My phone comes with a USB cable and will connect to a display out of the box using said cable.
--::{PC Gaming Master Race}::--