I bought a Steam Deck earlier this year and haven’t touched my Switch since. Nintendo hardware and games were already obscenely overpriced imo, so this is essentially a nail in the coffin for folks who were already questioning Nintendo’s prices and value proposition. Does Nintendo intentionally make its hardware really underpowered and cheap in terms of chips to juice profits? In the past this was more the case, but…
By "a nail in the coffin", do you mean that people will stop buying Switches? Because I would be very surprised by that. It's not like most people even know what a Steam Deck is. At the moment at least, the two devices mostly don't compete for the same audience. And if you want to play Nintendo's games - which a lot of people do, they're usually quite good - you don't have much choice anyway.
I have neither devices right now, only a PC.