1) What means "screwed"? You've picked doctrine earlier to gain advantage of it.
He picks doctine later as a reaction to your pick - maybe he realized, that you will have hard time to counter it.
2) 200 damage will wipe squads just as well as 300 damage and would be enough to take out that medic bunker. Not sure what problem you trying to address with that change proposal.
3) It's not like ML-20 is free. It is fucking 600 MP. It is like Windustry manpower penalty, except you can't utilize its bonuses early to get snowball rolling, because of 8 CP requirement. You should take advantage of that too.
Barraging HQ is a chep trick, I agree with that. There isn't much counterplay for such tactics.
But let's not pretend that opponent does not pay well for such possibility.
Relic definitely should do something with that without nerfing stationary artillery pieces to oblivion, because... let's be honest - the reason is in small map size. On 4v4 maps you can't bombard enemy HQs from your base sector. Hell, you can do this only from like middle of map which is super risky position for on-map artillery.
1) I wouldn't say it was early. Probably 10-12 minutes in. When does the ML-20 become available? Like 8 CP? It's not like it arrives super late at 12CP or anything, the game was still pretty even a that stage.
2) Or even reduce the damage to that of the LeFH and make it fire the same amount of rounds? Another solution would be to stop howitzers being able to barrage the HQ sector. I'd be fine with that.
3) So I'm supposed to steamroll my Soviet opponent before 8 CP, where I'm probably fielding one PzIV if I'm lucky? Rightio...
Don't get me wrong, I think the howitzer changes are awesome. But being able to barrage the opponent's HQ sector and just turtle your base meanwhile is very lame.