It is less aimed solely at making content for projector/ultrawide home monitors and more some folks just like the look of scope aspect ratio more, and feel it matches their content framing wise better than 16:9. Much the same way some photographers may find square crop matches some kinds of images better than 2:3 and not just for output intended for IG and the likes. As for gimbals they deal with completely different type of shake compared to IS/IBIS and you don't need anything special for lenses in this weight class and size, even my modest RS2 (consumer gimbal not high end by any stretch) is overkill for this and anyone remotely interested in video (anyone buying this lens) will have access to one. Not that they are always needed since sometimes you may want the handheld aesthetic or are locked down on a tripod.
There are more than squeeze factors to the look, a big part is folks may want the horizontal compression benefits sphericals wont give, the streaking flares, bokeh artifacts and so on. There are issues with these lenses but they get close to the look of much more expensive setups for extremely low price. There are issues such as the squeeze is NOT uniform and changes at close focus which can make ana mumps much much worse if you apply a 1.33 desqueeze uniformly (it shifts to 1.25 iirc). Common for the type of lens design (several ways of makign an anamorphic each with different issues) but hard to get around it at small size and price as the designs that don't suffer from that flaw are much bigger and harder to design. Also for those who want the oval bokeh and so on it is very very mild vs a 2 factor lens.
Just adding black bars to spherical lens in 16:9 output gives a very different look if you have foreground and background planes as it changes framing and so on. Only way it can be made the same is in flat scenes with only background, or only foreground subject against blank background. Otherwise the effects fl distortion on close objects, depth compression and so on all alters the look and is impossible to match adding bars in post. Apologies if that is obvious since it applies in stills world too but I overlook things like that too at times. For stills example like someone may think why get close with 50mm vs standing back with an 85mm and frame the subject the same, because it's gonna effect both my background compression and fov and the subject look, as well as DoF at equal f-stop, add into the mix I can get best of both worlds mix from with fov of wider, vs spherical lens at same fl, with some of the qualities of the longer one horizontally and the appeal (of these lenses) makes sense more.