First what you’re saying is completely false in regards to all Babyface songs sounding the same.Nah all of babyfaces songs sound alike. Jam and Terry have more range, imo
Range and being a better songwriter are not the same.
You can probably say they challenge themselves more but still not true because can produce Eric Clapton’s Change The World and turn around and make Tevin Campbell’s Can We Talk.
Note: Babyface did not write Change The World.