What do you mean, there aren’t any really tiny phillips screws? I’ve often seen phillips screws used in electronics, watches, etc. that are as small as eyeglass screws.
The problem with phillips screws is that its hard to apply enough torque to them by hand. When I’m working on a car or motorcycle, I often have to use an impact driver to get them loose. When I’m customizing a bike, I alwas try to replace them with allen heads (ok, that’s partly for looks), or with slotted screws if I don’t have the right allen head.