We're going off on a tangent here, but I don't agree. I mean, most people do have only one or two Phillips screwdrivers and use them on all screws they see that have a 'cross' on them, and I guess it'll work in the majority of cases like you say, but it's uncomfortable to work with the wrong size, and will damage your screwdriver and/or screws to boot. 'right tools for the job' and all. Having 3 sizes is not excessive IMO, and having only a #2 is not an example of a minimalist lifestyle. For disassembling an Xbox or other piece of consumer electronics you need a #1, for putting up drywall a #2 and for mounting a heavy bookshelf a #3. All fairly regular tasks I'd say.