Yes, that’s what I also mentioned in the comment at Point shape was changed from squares to circles · Issue #13217 · CesiumGS/cesium · GitHub . It sounds like a low-hanging fruit, and there have been requests about changing the shape, e.g. at Change the shape of the points in the tileset and other places. It doesn’t seem to be a priority, though, who knows.
However, you may have seen that the regression was fixed in the meantime, via Fix point-rendering regression where square points become circular by markschlosseratbentley · Pull Request #13219 · CesiumGS/cesium · GitHub , and the default shape will be squares again with the next release.