Oh, so I guess 90% of software developers are in the wrong then? The whole Adobe Creative Suite, Thunderbird, Firefox, Chrome, virtually any program except Evernote and iTunes manage to keep the icon pinned. And no, there's no need to uninstall the old version for those programs either. I don't think it's msiexec that needs to change, I think it's your attitude. You are abrasive, condescending and in denial.