What i have seen the reasons in here are
1. The cameras are usually old and even if they were good when installed, the definition of good has changed
2. The cost. There are hundreds of cameras in a medion size building, and it would get really expencive to get good cameras.
3. The storage. Storing a month of 4k video takes a lot of space. Them being still helps to compress the video because you can just take a backround picture and only store moving objects, but thats still a lot. So you have to choose to either keep good quality video for a short time or bad quality for a longer time.
4. There is no need for good quality, because the precense of cameras is enough most times and from the rest bad quality video is good enough most of the time. Its really rare to actually need hight quality video
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