Tbh even if the Switch doesn't end up becoming the greatest-selling console of all time. I still easily consider it the most truly successful gaming platform of all time. It is by far the most profitable console of all time, even the DS and Wii combined couldn't attain Switch-like profits. None of Sony's consoles had profits as high as the Switch right now, even the PS2.
Also, I consider the Switch to be the most truly successful gaming platform because it was able to sell so many units without needing any sort of price cut despite the expensive 300$ price point. The PS2 and DS needed to be impulse buy cheap at around ~99$ for much of its life to sell as much as they did, by the time the PS2 and DS reached 120M they were already priced at around 99$(~140$ In 2023). The Switch is approaching 120M sold STILL at its same launch price at 300$ with the 300-350$ models of the switch being by far the most appealing, that really goes to show you just how much of a strong appeal there is with the Switch for such a large consumer base since there is still such a large market for the Switch despite already selling 120M and still being priced at 300-350$.
The Switch also sold this much at this high of a price without needing to rely on an essential non-gaming feature like the PS2 where a good portion of consumers purchased the PS2 with the main intent of using it as a DVD player, didn't need to rely on multiple completely different and cheap iterations like what we saw with the DS,DS Lite,DSi, and the Switch is viewed as more of a home console by consumers rather than a handheld as proven by the much higher sales of the Switch & Switch Oled despite the much higher price, which also shows that Switch sales are nowhere near as inflated as the DS since the Switch isn't purchased as much per person and is purchased more per household since many players are electing to pay extra get the TV version of the Switch, which is the version that's far more likely to be shared amongst the household than a DS. When it comes to the shear amount of users who purchase and utilize a gaming platform with the main intent of playing games, Switch could be considered #1 despite being #3 in the console sales ranking