Low notes or high notes ... what does it matter? What matters is the emotions he puts into each rendition. Salman sings with such emotions that there has rarely been a guest who left with dry eyes.
It is his forte to sing high notes. Let it be his speciality. He does not need to croon and sing soft songs. There are plenty of Arijits and Sonu Nigams around. But a Salman with such a voice, that can reach an unbelievable pitch... WOW! India .. appreciate this.
If You think he is not good enough or versatile enough , you are seriously thinking trivially. Think of him as an artiste with great potential.
Freddie Mercury . Placindo Domingo and many sopranoes are known only because they can reach a certain pitch . AND they did not bother to prove themselves by singing octaves lower.
Talent and Art in any catergory is just that... Talent and Art.