The whole point of this thread is to be a celebration of an achievement, one which is not reduced by how other games are doing. Making it to 20 million copies sold is an incredible proof of success, it really doesn't matter how other games are doing - CP2077 is doing great and has been highly profitable.
It's something that isn't really worth arguing. So I will end with this and then bow out. The reason we know celebrating 20 million sales is worth it is because:
1. It shows the game is profitable.
2. One of the reasons we know it shows the game is profitable and how it is doing is to compare it to other similar titles in terms of scope, budget, etc.
Which is to say... CDPR and the games they make are direct competitors to studios and games like Rockstar (GTA, RDR), Bethesda (ES, FO, Starfield) and Ubisoft (AC). Cyberpunk surpassing something like Fallout 4 by millions of sales is a big deal because it gives us an idea of just how popular the game is... because Fallout 4 is recognized as a wildly popular, successful and beloved game. So when Cyberpunk smashes the sales of that game it gives people a good idea of just how successful it really is. A lot of people consider The Witcher 3 the best game ever, so if it eventually passes the sales of that game it shows just how incredible Cyberpunk is doing. So on, so on.
I will also note no one brought this up until someone made the repeated claim that Cyberpunk ought to have already sold a
HUNDRED MILLION copies. Which is to say - people were explaining to someone why that is an outrageous claim and that 20 million is worthy of celebration and acknowledgement rather than something to be critical about. It was essentially someone saying...
"Baseball player X is amazing! He hit 100 home runs in his first two years in the league!"
"Well - if player X was really as great as people said he would have hit 450 home runs in his first two years in the league. After all player Y has hit 450 home runs!"
"Yes... but player Y has been playing major league baseball for fifteen years - that isn't really a fair comparison."
Ultimately it is beneficial to compare the sales of a game against its direct competitors in order to get a sense of how successful (or unsuccessful) a game/studio has been. I don't see why that is problematic. Nor do I see how that detracts from the accomplishment. In fact I didn't know a lot of the data that was posted and it actually gave me a good picture of just how successful Cyberpunk 2077 has been.