[Fej]

For games that require low latency, such as twitch shooters and (traditional) fighting games, a wired connection is indispensable. I don't think the "hardcore" platforms will ever remove it.

Regarding Nintendo, while they've never shipped a console with an Ethernet port built-in, they have supported it since the GameCube (Broadband Adapter); the Wii, Wii U, and Switch all accept standard USB Ethernet dongles. Use of these adapters is somewhat widespread on the Switch, particularly for Mario Maker and Smash (although this is more due to Nintendo's incompetency with netcode than inherent latency in Wi-Fi).

[asdff]

It's not for the latency, its to maximize your bandwith for downloads and updates which are in the 100s of gbs these days.

[Fej]

It's absolutely for the latency, it's almost a faux pas to play the games I mentioned online at a high level without an Ethernet adapter (since there's a decent chance you'll get a match with others who are). Additionally, the Switch is the sole major gaming platform which has avoided the bloat endemic everywhere else; there are no games on the platform anywhere even close to triple-digit GBs in size, or even half that.