I'll try to keep these both short.
Magic the Gathering - the "Power Nine"
There's 9 cards from the first few printings that were simply deemed too powerful. Once they were out in the real world, the folks in charge realized they weren't fun to play against, and resulted in wildly uneven games. In extreme cases, the opponent could lose without even getting a single turn. They've been banned from every format*, and have never been reprinted*. *Except of course when they are. https://mtg.fandom.com/wiki/Power_Nine
Model railroading (O-gauge). Lionel 770e Hudson
For O gauge size, the train everyone wishes they had in their collection is the 1937-1941 Lionel 770E. This was a super-unusual toy for its day, pretty much everything else had been aimed at younger children and a lower price point. Lionel decided to take a gamble and build a hyper realistic scale model that was aimed at young adults. It was honestly not a great seller in its day due to the high price point and the looming threat of WW2. But it was, and still is, considered one of the highpoints of the industry. You could argue that the current Lionel company is founded on this concept, as their VisionLine products are focused on ultra-realistic toys for grown ups (which will always be funny, as yes, our track has 3 rails). https://www.youtube.com/watch?v=FOdDw0-Tflg
The upcoming Slate pickup claims to be focused on being a simple EV that a regular person could repair. It doesn't even have a stereo. That said, I have not specifically seen a guarantee that it doesn't have an internet connection.
https://www.slate.auto/en