A crank scraper or a windage screen would be better than a windage tray. The oil needs to get back to the sump as fast as physically possible and a tray slows that process. On factory big block trays I have added louvers and drilled holes to help the oil get to where it needs to be. An aftermarket tray has added louvers for a reason.

as to why Chrysler stopped , ask them , they will tell you , but I'm sure it had a lot to do with cost.