I think they should. Theres a fine line between beneficial and detrimental. I had a 3DS growing up and could browse the web with its very gimped browser, and I think something like that is actually very good for a child (able to access the internet and view simple and informative sites while being too limited to access social media and the like)
I'm kinda baffled about the Switch store's quantity of dating/whatever adult-ish games.
I don't really want to turn on age-based filters (to the point that I've never investigated if they even exist) but at this rate, there's hardly anything worth looking at in the recent feed.
The target demographics for Nintendo products have shifted from kids to.. kidults? Most kids nowadays play on phones or in rarer cases PC/Xbox, Nintendo's lost much of their cache (in my visible experience) save for children parented by the "mindful milennial" types