I can't think of a single active artist that produces music like the ones listed in the OP. Music specifically for the youth.
Granted, when I talk about Sammi I'm referring to his "I like it" days, not his messy VS days. Same with Chris Brown, when he was a vibrant young man that loved to dance and sing. Same with a young Ciara during her 2step era.
I'll even give lil Romeo and lil Bow wow their props for putting out hits for the youth when they were kids.
I believe artists like these help shape a culture in young adults but I haven't heard of an artist active like the ones I listed?
Some of my favorites-
Safe artist aren't in with the mainstream today.