At the end of day 2, Pakistan were 97 for 8 in reply to Oz 429.
In the end Pak made 142, which was 287 behind. Four day or five, no difference to this point.
What did happen, in a 5-day match, was that Oz made another 202, leaving Pak to score 490 off 213 overs.
Had 90 fewer overs been available, they would have had to adjust that. It wouldn't have been 490 off 123 overs, probably, but perhaps more like 420 off 105, the familiar tricky last hour (in the dark!) plus a full day. There would have been zero chance of Pakistan winning, and we would not now be talking about a great Test Match.
Up until WW2, all* Tests in Oz used to be 'played to a finish', i.e. there was no time limit, no draws. This surely is the purest form of the game; you just play until it's over. It was not necessarily conducive to exciting cricket, and you can't imagine it today, with all the tight schedules...but sometimes I wish the odd game could be played this way, such as Hutton's match in 1938, which was also timeless.
However, I'm happy with five days, would be unhappy with 4, even if they could bowl a few extra overs.
[*All Tests? Certainly the Ashes Tests were, in at least some series between the world wars.]
Bowlers win matches