Well yeah, people have different preferences so of course that for some people Switch can be main or only gaming device.
Saying that, I was never liked to play handhelds, but with Switch is totally opposite, I love to play on Switch in handheld mode, its so easy and practical to play Switch in handheld mode even if you have only 10-15 minutes free time for play, compared for instance of playing PS4 or any other home consoles. I just finished Valkyria Chronicles 1 and before that Dark Souls 1, games that I could easily play on my PS4 (I didnt turn on my PS4 for months now).