Why number of year end no. 1s is more important than total weeks at no. 1

[THE FIGHTER]

both are irrelevant stats. IMHO. winning majors on 3 different surfaces in the same year is obviously the end all be all. a lot of good players have year end no. 1 rankings and multiple weeks at number one. but winning slams on 3 surfaces in the same year? no one in history has done that, except the very best.