I guess NW fresh has no idea what hes talking about.
Its an increadibly abusive tactic. Get up to 5-6 maxims and attack move, deny capture points till T-34 76s then T-34 85s, game closed. Goodnight. Zis guns for any armor harassmen which can also use the abusive barrage for those who even contemplate grouping together.
Biggest problem is the durability and supression of the squad. Merge is also a joke as they can continue to reinforce
This is the sort of thing that you win via positioning and coordination. Out maneuver the AT guns, flank the maxims. Good flak track usage will easily beat multiple maxims, as long as you can avoid the Zis.
It's easy to theorycraft "He builds lots of maxims and a zis and then rushes tanks" and it definitely is a viable strategy, but the counter is also equally viable it's a matter of outplaying your opponent.