This is getting circular, as noted BRIGHTER but LESS contrast.
They aren't fully able to, there are engineering complexities some companies have overcome that others have not, there are also blocking patents like everything. Many times companies dive into new tech into projectors the first version is a buggy mess and can't compete anyhow, we've seen it happen before. Companies are just people, people make mistakes, companies like people are ADD, they like to focus on what they do best.
Sony does a good job of making great stuff, but they also have lost money doing it. I don't know much about the companies behind Sim and Christie, but I know they didn't burn as much cash as Sony, Sony is basically a money pit with audio/video, the stock would be worth more if they just stopped making everything video related.