4K TV signals invariably suck, absolutely. But depending on people's preferences, they may think the vibrant colors and improved sharpness of even a mediocre 4k HDR stream looks "better" than a higher-bitrate 1080 SDR video. Personally, I'm a bit of a purist so I prefer SDR blu-ray unless the source material was filmed with HDR in mind, but I totally understand why others prefer the "pop" of a 4k remaster streamed over Netflix. It's all different preferences.