Many years ago, a pro was complaining on a famous photo forum, that his sony a9 camera (which was one of the top cameras at the time) and zeiss lenses setup was stolen. He was so upset, that he bought a T2i and the kit 18-55 lens. He specialized in photo wall business. He said that for A9 and zeiss lenses, he only needed about 20 photos, for t2i and kit lens, he needed 50 photos. However, he spent more than 10 grand for software stitching these photos. I guess that he also needed the special nodal point tripod head.
Not sure if anyone experimented with 4 4k cameras with the nodal tripod head to combine into a 8k stream. For still scenes, you just need one 4k camera to move to 4 different positions. But for moving scences, then you need 4 4k cameras recording at the same time, which defeats the purpose of saving money.