>>22295
>The main downside of multi turrets it's very hard to coordinate several turrets

There were also mechanical problems. For example, T-35 almost didn't seen any combat, most of tanks broke before. But T-28, having same problems, had relatively successful action (for outdated old tank). Similar scheme - tank with multiple guns in barbets and sponsons - was used by Americans (M3) with mixed results, but wasn't complete failure.

Another problem was size, multi-turret tanks were big but had less armor than single-turret counterparts.

But overall idea wasn't that bad I think. At least for 30s.

>interwar doctrines were really an extension of ww1 doctrines nothing too revolutional about it.

Soviet doctrine was pretty fast-paced in design: https://en.wikipedia.org/wiki/Deep_operation