What you define as ton of data for a consumer drive is your opinion only, there are many customers who do video editing work and really want/need the disks they buy to fulfill their stated technical specifications of write speed.
Samsung witheld/lied about the write speed, and only mentioned TurboWriteCache in hard-to-find support forums, because they know it matters for a meaningfully large segment of the market.
Its easy to state "about 250mb/s write speed, up to 500mb/s burst write speed" in marketing materials, if it didnt impact the sales as you state for consumers, why wouldnt they?
It's a perfectly fine tradeoff for a consumer drive. Just because it doesn't fit your use case doesn't make it junk.