Why HD doesn't always "equal" HD ($250 VS ~$4,000 cameras)

Back in the decision days, I thought that an HD camera that cost about $250 could also produce the same level of video as a $4,000 camera, simply because both video camera's specifications indicated a video resolution of 1080 pixels at their shortest length of pixels; I was quite wrong. It's not just resolution that makes a difference (think HD versus 4k). These days, there might be cameras that cost only a couple of hundred, or cameras that cost thousands, each of which can record 4k video, but that's about where the similarities end. You see, there's a lot of technical details that matter as well: sensor size (bigger is usually better), file format (DNG is generally considered as overall the best), Bitrate (a faster bitrate means the more information can be processed at once: 60mb/s versus 400 mb/s), as well as Codec (Think H.264 or H.265); Oh yeah, on top of that, there's also (I forgot the name for this specification) 4:2:1 versus 4:4:4~ the latter is lossless, meaning that the full amount of information can be recorded, and at time of writing, very little, if any cameras, can achieve this. Crop factor is arguably also important (think 2x versus 1x) because it defines how much of the sensor is used for video. Color /bit depth: think 8 bit versus 10 bit. Examples: For about $900, the Fuji XT-30 can do about 300mb/s, has a bit depth of 10, 4k resolution, and can use the top-of-the-line H.265 Codec with a sensor size fairly close to 35mm (Full Frame), and can record in 4:2:1 (4:2:2?) and has an almost, if not nonexistent, crop factor, although it won't allow you to gather RAW or DNG frames from it's video; that's an example just to give you an idea about what money can get you for video, but keep in mind that the XT-30 is a stills-focused camera, so is really not a slouch at all as it has to do with video. It seems that, with time, cameras are becoming increasingly more valuable for their price, for photo and video production. Overall, the level of video that will probably soon be possible with prosumer camera in the next five or so years will give photography-oriented cameras a run for their money, because the quality of the frames that can be gathered from such cameras will meet or possibly exceed that of still cameras; so that can make decision making (Do you need a camera for still photography, or for video creation?) difficult to say the least. At the same time, things might become easier. For comparison,