Here's what I replied in that other thread you was complaining in:
Actually, having a 'HD' in the title often helps in identifying it within iTunes for syncing to your device. If you own both an iPhone and an iPad version of an app, it's not apparent which is which before you sync it over, unless the name suggests it. Just my 2p worth.
Granted, it doesn't have to be 'HD' but it's as good as any until Apple sorts out iTunes for identification before you sync, instead of one long messy list of apps. I suppose 'for iPad' also works, but that is also in your complaint, how do devs win?
iTunes should handle this - users should know which apps are for the iPhone, iPad or both.
I agree with the OP - the "HD" needs to go.