Size of team has no bearing in this argument. Saying they were small so they get a pass at preventing obscene download sizes is like saying “Napster was created by one man, surely he shouldn’t be accountable” but he was.

When making a game, once you have something playable, is to figure out how to package it. This is included in that effort. Determining which assets to compress, package, and ship. Sometimes this is done by the engine. Sometimes this is done by the art director.