Because it is Nintendo, it is not really surprising.
If it would be any other brand, it would be surprising
because Switch is overpriced, toy like quality, specs were bad even on launch (related of the high price), too many games are low quality/simple, ergonomics are shit (vita is also uncomfortable without grip add-on), games are way too expensive (launch games still at full price), many "big" games are wii u ports including BotW, 3rd party ports look like puke and run like snail because of the cheaped out hardware and so on.
Anyone else would sell system like that and it would not succeed.
My point is that because people "love"(how do you love an object?) Nintendo, they get away with things that others would not, which makes it kind of sad. As in if they would have to try their best, they would not go with half lights and gamers would get better games + system, right?
I get it why people like it, but I personally dislike that lot of potential is lost to the lazy business tactics of making cheapest possible thing and sell it on highest price.
I got mine about 6-8 months from launch and after the launch year there havent been anything really interesting. Only "nintendo game" I like is BotW, and xenoblade 2 + mario&rabbids were nice.
But after that = nothing, or it is hidden in the thousands of vaporware titles.
Does it sell like crazy, mostly yes (never sold out here unlike all playstations tend to do)
could it be better with minor changes? definitely yes.
My point is, that Nintendo fans and gamers + media dont criticize them enough so they get away with it.
As an example if a reviewer would hate Mario odyssey and think it were the most boring game of the year (like I did), could they honestly review it like that and give it 2/5? No, their career would be over because "nobody can hate mario"-politics.
While nintendo audience gives them all the money they want, they dont give them enough pressure to grow into something better.
Because, why would they try more when bare minimum is enough? Like those pretty girls whom get everything free in their life, they never have to grow into something better.