I disagree, honestly. Lack of a cameraman doesn't cause boring angles and boring videos. Laziness, cheapness, and bad chemistry do. You can have multiple tripods, or shift one tripod around for multiple angles, then edit it together. Some OF/JFF pages even upload multiple copies of the same video with different angles so you can choose your favorite, at no additional cost, but a lot of these OF guys don't want to put that level of effort into their videos. And if the guys have no chemistry, then the lack of effort becomes harder to ignore. People love amateur porn despite the bad lighting and singular camera angles because it has something that studio porn lacks: authenticity. When OF guys have bad, boring sex and then put zero effort into the technical side of things, it's like having all the negative parts of amateur porn with none of the positives.
Though personally I think OF videos are better without a cameraman. OF videos with cameramen don't have the same fly on the wall effect and "porn magic" that studio porn has. It's too obvious that there's a person hovering around the people having sex. You can see and hear them moving around the room, you can see their shadows, you can spot them in mirrors, you can hear them breathing, and their fingers sometimes get in front of the camera lens. I'd take a few well-placed tripods over a cameraman almost every time.