There was a lot of luck on the 49ers side when they upset the Packers in 1999. They were really lucky a fumble wasn't called on Jerry Rice. They were lucky Steve Young managed to maintain his footing when he slipped while dropping back on his final pass. They were lucky that Terrell Owens - who had 3 drops earlier in the game - didn't drop the ball in the end zone after being pounded by 2 Packers.
I'm not disagreeing with you, but offering that there are multiple angles to view even that game from:
- Maybe it wasn't luck, but Jerry Rice's impressive credentials that led the officials to not rule it a fumble
- Steve Young was a great QB, so instead of luck it could have been his great balance that allowed him to not fall down for a sack
- Terrell Owens, while still learning to be a great WR at the time, clearly ran the route perfectly and was strong enough to hold onto the ball despite the double-hit.
Viewing any teams' win as lucky may be true, but based upon the lens it is viewed through may also be neglecting to recognize the skill and determination that also contributed to a win. I still think that the Packers were darn lucky to beat the Raiders in the "Irv Favre" game. Brett through some of those balls into double and even triple coverage. They were lucky catches, but I also can't dismiss how hard the Packers WRs were trying to not let Brett down in that game. They made some incredible plays because they had incredible motivation. Some of those plays sure looked lucky though!