He could have if that is what he wanted to do. In a 64bit OS, the 64bit version of the browser will run faster and smoother, and many websites will load faster. The only problem is the coding for some websites aren't 64bit friendly. Since he wanted to use the 64bit browser for 90% of websites and the 32bit version for the other 10% that aren't 64bit friendly, this was the best option. By default, the 32bit version is the default web browser, so that was not the issue in case that is what you were thinking. For his specific needs, the solution we reached was the best. For others, a different solution, like the one you suggest, may be better. It all depends on the person.