IMO an advantage set is the only real thing to finish a Grand Slam match
for me, a tiebreak is somehow a "shabby" way to end a match...
just imagine all these scorelines if the tiebreak game was NEVER INVENTED!
earlier all the matches and every set were an advantage set
guys like Karlovic and Beck would play until 18-16 every set then
no, I think the tiebreak is okay and necessary for sets #1 to #4, but should not be decisive in the final set