I am really surprised that you think HDR is crap. From everything, I've read its the 4K that's the marketing gimmick, at least with flat panels. HDR is really what makes the picture so much better than 1080P. I see you are an installer so you are a lot more connected then I am. I was really under the impression that dynamic HDR coupled with a high-end OLED was the holy grail of picture quality.
HDR is marketing, not reality. Reality is the REC2020 color space and expanded luminance when it comes to displays.
For photography and videography, HDR actually means something as it takes the limited dynamic range of a image and over/under exposes the image to allow for greater detail in shadows and in highlights. But, for video playback, you can't do that. You get what is presented, and that's not really 'HDR', that's just 4:4:4 video and the improved luminance information. But, it's being marketed as HDR instead of having been designed into the system from the ground up. It's made much worse by competing formats that have, basically, zero added value.
For front projection, which lives on 'peak' brightness at all times, the ability to deliver specular highlights is just impossible and any marketing about HDR support becomes nearly meaningless because projectors can't actually do it at all. They can play back the content, but they will never have a sun that blinds you. There will never be a reflection that does the same. It's just the same 'white' that is used everywhere else. If it isn't, then you likely will find the image to be dull and the reduced typical contrast will not be enjoyable. At some point, perhaps we will see 10,000+ lumen projectors that are a couple of grand that have 5,000:1 real world contrast, but right now, people are happy with their 1,400:1 contrast projectors and that's as good as you get. HDR demands much more than that and much higher brightness... Since projectors can't deliver that, the entire concept becomes quite meaningless.
We are back to the singular concept of how well a projector performs with: Contrast, Color Saturation, Motion Handling, Resolution, Black Level, Shadow Detail, and Highlight Detail.
Not that those are even considerations for most of the buyers out there, but around these parts, those things do matter.