Because of the low sales of the wii u Nintendo has withdrawn from making a normal home console but instead added tv output to their new portable system. Clearly a portable system that is trying to sell into the vacuum they have created by withdrawing from home consoles. I don't think this is hard to work out and hardly seems debatable.
If you say otherwise then basically any portable system with tv output is a home console like one of these things below which seems ridiculous. Many such devices actually produce higher res tv output than they can show on their built in screens just in case someone was going to make that point.
Higher up models can support bluetooth too and can support both wired usb and wireless bluetooth joypads. Just in case someone was going to make that point.
Previously companies didn't market such devices as hybrids because the performance level for tv output was not competitive with home consoles of the time. Switch is not competitive with home consoles but Nintendo wants to try and attract customers who previously owned a wii u.
If the Switch is anything its a hybrid tablet and portable games console because its controllers can be removed and assume it can be operated with just its touch screen. Tablet functionality would require a reasonable range of apps which the Switch doesn't appear to have sadly.