Not to be pessimistic but I think the chances of them fixing this are close to zero.
Spending thousands of dollars doesn't entitle you to a brilliant gaming TV. Since LCD became mainstream, there are plenty of brilliant TV's that are laggy, and cheap terrible TV's that are not.
The Sony's and Samsung's mentioned had bad input lag with HDR (over 100ms if i remember), that became slightly less terrible. (60-70ms?)
Seems pretty fundamental combination of processing hardware, firmware, panel, processing hardware, and not something that is merely differences in firmware / software optimization.
Very little hope of getting a HDR gaming TV with minimal input lag without either doing a lot of research to find the unicorn, or waiting a few years for hardware to get better.