Sure it can. 3 channel slams speaks for itself. Winning 6 titles at the biggest clay court event of the year in an era where you had players who were raised on and basically spent all of their time playing on the stuff, and then within a matter of weeks being able to switch and win the biggest grass court event of the year against an era of players raised on that stuff, doing that at a time when winning on those two surfaces required entirely different skill sets is far more impressive to me than a guy who won so much because the majority of courts he played on favoured his style of game.
If people like to belittle a guy like Nadal, and all the players today because they accomplish all they do playing on slow surfaces then you can't think all THAT much of Sampras who basically accomplished everything that he did playing on quick ones.
Sampras has a competitive spirit like few in the history of the game, and if we want to talk fierceness of mentality between he and Borg then that's a conversation worth having, but as far as I'm concerned when it comes to the complete package there is nobody comparable with Borg. Certainly not from the eras that have come after him.