I am neither.. but a game with 5 fire starters would mean 70% of the fire pokemon are a starter or something similar, while the rest of the types have to rely on casual pokemon and only get something awesome if they have luck, if you see what I mean.
Such a thing could be done as gift in later part of the game too btw. Like the Hitmon choice halfway through gen I games, except it would have different techniques than merely two Fighters to choose from, or exotic powerful 3 stage pokes of different kinds of creatures...or some other themes