IF there was 5 man 'Training battalion', I can largely see these being used as frequently as Grens. Grens/PzG would do the DPS, while the Trainees cap/soak it up.
But I wouldn't agree that core infantry squads aren't dramatically asymmetrical. Because the LMG exists and the PPSH isnt worth a goddamn unless your on Stalingrad (which I veto any damn way).