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/2DS
3DS at launch was a far worse value than Switch at launch for parents - especially without worrying about whether 3D is actually good for young kids
Its no surprise that Parental Controls video is in the top 5 most watched videos in several Nintendo channels.