You were one of the parents who bought a cheap 2DS last year with Pokemon Stars Moon for your kids. Switch is actually easier for smaller kids to use than a 3DS, due to the joycons and stand. I would also not underestimate the two controllers that are suitable for kids - for games like Splatoon2, MK8 Deluxe, Super Bombermam, Snipperclips, Skylanders, Fast RMX, LEGO City Undercover, Puyo Puyo Tetris, Sonic Mania, Shovel Knight etc the device and control scheme is a much better value than 3DS at launch.
Lets also not forget the evergreen kid title Minecraft is coming to the Switch this year and will never launch on 3DS
Its no surprise that Parental Controls video is in the top 5 most watched videos in several Nintendo channels.