I think it's pointless getting worked up over something that's bound to happen eventually. When Mariah and Janet achieved their impressive run of top 10 hits, it was done during a different time where digital and streaming did not influence chart positions.Not to take away from Rihanna's achievements, because she certainly works hard and if it wasn't her, it definitely would have been somebody else.
Female artists with the most top 10 hits:
Madonna — 38
Mariah Carey, Janet Jackson — 27
Rihanna — 26
Whitney Houston — 23
Aretha Franklin — 17
Beyonce, Connie Francis and Olivia Newton-John — 15
Pink, Donna Summer, Taylor Swift — 14