Like Manoj "sir" said, yes it's bound to happen with all 3lcd PJs and some pJs will have it more than others. But once you manually adjust the panels, the difference is too little to notice unless you're standing right next to the screen, especially with the 1080p projectors.
With a Dlp, you'll never face this issue but then Dlp has its own fair share of issues (limited lens shift and zoom) and not perfect either.
Yes, manually adjusting panels help, but its quite tedious process and needs patience. Also, it is not a feature on all the projectors. Its a feature on 5010/6010/5020/6020 but not an advertised feature on Epson 3010/3020. People have found the hidden menu. We can't assume that its a feature on all LCD projectors.