I don't really think they have been forgotten. At least not by regular users. They have been forgotten by YouTubers because they need to sell you the newest stuff from the same company.

They create a fallacy then all of a sudden IEM tech has never been better and you have to buy stuff made in the last year or you're missing out

I think the opposite is true. I think the best value proposition is buying something like tin t2. Would you can now off and find on discount.