In fact it shows very clearly how much power does matter. On PS and XB, people are discussing 2-3fps differences in certain scenes between these machines, or how 30 or 60 fps is the better experience. But that lasts only for a couple of days after the games launch, then everything goes silent because people are enjoying their time with the game.
On Switch on the other hand, we still bring up performance issues of games that have released years ago because their performance is so laughably bad on this device its become a meme at this point.
With regards to sales however, no it doesn't make a difference if the value proposition is there regardless.