but actually they come in less soldiers per squad so its natural that they get better quality support weapons too
Vickers is the worst MG in the game and only comes in 4 man. Not only are its suppression stats horrible, it is going up against units that are designed to murder larger model squads from long range, so it will typically get vaporized before it gets anywhere close to suppressing. Squad size isn't a good indicator of how a unit should perform anymore. There are too many pros and cons associated with differing squad sizes.