I'm getting the impression that MG and multi turret designs are going to become intentionally ineffective, at least past quite early wars.
I really don't like that approach. The new designer adds a lot of customization and options, so why would some of them purposefully lead to dead ends?
A multi turret tank historically and practically can't compete with a standard design, but I don't think that should cause them to be entirely obsolete. Awkward and unusual designs in a system based on customization should be viable designs, if done correctly.
Slapping a bunch of turrets on a tank for soft attack could be a strategy to avoid/delay arty techs, or simply not pay tungesten costs for standard howizters. A multi turret tank with a series of AT turrets on it might add a fair bit of hard attack, but not much piercing at all. I could mix in heavier TDs for piercing and get my hard from those multi turrets. They could be anti light armor divisions/battalions, shredding armored cars and halftracks instead of using much more expensive standard divisions.
HMG/autocannons are almost explicitly soft attack systems. That's a very specific niche, but one that can be filled.
A light tank or armored car that's just a pile of MGs should be a very very cheap way of getting soft attack and hardness on a division, not something that's simply thrown out after 1940 because its simply obsolete now. These lighter divisions might be much more forgiving in terrain, letting them clear out cities easier than normal tanks, or fight in asia without supply or jungle pains. They're so cheap, maybe I could sprinkle armored cars and MG tanks in with certain infantry templates to give them a small edge (if armored car HP/ORG stats get fixed). Perhaps even drop some of these with paratrooper divisions since they're so light.
These MG/multi turret tanks are inferior in a LOT of ways to normal tanks and tank designs, but I'm getting the impression that they're going to be absolutely useless after a certain date - and I don't think that's good design in a system built for customizability.