About PS2: it was rounded up of course. I mean, if Sony themselfes say "more than 155 million" its hard to believe 160 million or even more. For me official sales from a company count and not some "in memory of" number. 16,5 million PS2 and PS3 where shipped from April 2012- March 31. (PS2 was axed january 13, 2013). We would need the PS3 number for march 31, 2012 and march 31, 2013 for us to figure it out. I mean what if Nintendo released a Game Boy Advance (Micro was the last one) i suppose "In Memory of 83.358.295 produced units"? It would be demo stations, replacements, promotion machines for E3, TGS... But this cannot be counted as a "shipped" unit because like we both know as "colleges", these demo stations get send back to the companies. No way they repack and reship/ resell them, as they are programmed completly differently. They are not for sale/ costumer use. So 81,51 million is the official number no more no less. We do not have official PSP shipments- and like the PS2 we'll probably never know- but its save to say it cracked the 80 million number (although it was never really confirmed officially), but never did it pass the GBA. IF it did Sony sure as hell would not have kept silent about one of the most historic achievements in gaming history: Passing the sales of a NINTENDO HANDHELD (the Game Boy Advance). The Guinness Bock of Records, newspapers, media... everything would be full of it.

Nintendo does not compete with either Sony or Microsoft.

You can in fact say the Wii beat the PS3 and 360 and the Switch beat the PS4 and XBO based on system sales, you can compare them like that, yes.

Now, the important part, they still never competed, the Wii or Switch success did not affect the other system sales, both still sold 170M+ units combined, those two on the other hand compete directly, and one being up means the other being down, like the Football example you gave, for one to win the other has to lose, that's not the case at all with Nintendo.

Nintendo platforms do not receive the modern new game releases, the vast majority of people will not consider either the Switch or another platform, they either want to have both or they only get Nintendo and indie/older games, basically excluding themselves from most new game releases. They can still only care for Nintendo games, usually happens to younger people or people getting systems as gifts, and they proceed to get another system (be either PC, Playstation or Xbox) later on if they plan to get access to most modern games.

Sony and Microsoft were directly competing for where do people want to play the new releases from the industry aside from a PC (PC does not canibalize console sales, at least not yet), they are into the Greece vs Portugal situation, actually even past that as Microsoft accepted they can not compete directly with Sony and are moving to a subscription based model and even porting their own exclusive games to Playstation. Maybe none will be truly into competition next gen.

Nintendo does not compete with either Sony or Microsoft.

You can in fact say the Wii beat the PS3 and 360 and the Switch beat the PS4 and XBO based on system sales, you can compare them like that, yes.

Now, the important part, they still never competed, the Wii or Switch success did not affect the other system sales, both still sold 170M+ units combined, those two on the other hand compete directly, and one being up means the other being down, like the Football example you gave, for one to win the other has to lose, that's not the case at all with Nintendo.

Nintendo platforms do not receive the modern new game releases, the vast majority of people will not consider either the Switch or another platform, they either want to have both or they only get Nintendo and indie/older games, basically excluding themselves from most new game releases. They can still only care for Nintendo games, usually happens to younger people or people getting systems as gifts, and they proceed to get another system (be either PC, Playstation or Xbox) later on if they plan to get access to most modern games.

Sony and Microsoft were directly competing for where do people want to play the new releases from the industry aside from a PC (PC does not canibalize console sales, at least not yet), they are into the Greece vs Portugal situation, actually even past that as Microsoft accepted they can not compete directly with Sony and are moving to a subscription based model and even porting their own exclusive games to Playstation. Maybe none will be truly into competition next gen.

Inflation, lack of price cuts, PC gaming on the rise (more expensive but an open platform), Switch's success (doesn't matter but it IS a direct competitor), less cross-gen titles shared between PS3 and PS4 than now, and PS4 Pro launching a year earlier aligned than PS5 Pro.

With all those barriers, it's impressive that PS5 is only about 2.2 million behind. If it ends up 5-10 million units behind, it would still be a big success and possibly more profitable still.