Don't judge me, I was bored and decided to analyse your arguments.
1) Really? The Module System is so old that everyone has essentially got used to it and learned to adapt. IMHO, the Module System isn't even that bad anymore. In fact, it was actually a relatively underrated update, as its long term benefits were actually useful. Prior to it, barely any of the high tier paints could hit 150% in total protections, now every single M3 module can be MU'd to 150. Also, there's no such thing as a "temporary solution" - the Devs are either gonna "fix" the turrets or not.
2) Wait what? Yes, the players do get to choose what maps they want to play in. *facepalm*
If you're talking about Matchmaking (which you better be because if not, your point is completely invalid), it's not even out yet and what you saw was essentially a 'prototype' - so to speak. This 'prototype' will be amended most likely.
3) LOL. Premium ... OP? It doesn't actually even give a direct advantage. The crystals/EXP gained are earned, just multiplied, more than normal. You can still get Premium from Missions, which is actually rather generous of Tanki tbh. Yes, the game needs to make money and Premium is one of the best ways they can do so IMHO.
4) Yes, it's inefficient but Tanki has done what it's obliged to do - it has implemented an anti-hacc system and a set of Moderators. It is our responsiblity to follow the rules. The devs can't spend all their time trying to perfect a banning system.
5) Firebird is OP at lower ranks but you simply have to stay away. If anything, I'd say Isida is OP, Firebird can be left alone. Regarding Twins, I think it's fine - it's basically always been strong, never underpowered. It takes some (not much) level of skill to it and can be deadly.
6) Currently, yes, they are exclusive to the Shop. Though, I don't see the problem with that. You're complaining that they are OP and calling for them to be nerfed yet you want them to be more readily accessible? See the contradiction? Honestly, I don't really think any of your suggestions are really that necessary. I am not one to blindly support Tanki in all its decisions, I've even made a massive rant topic about Isida but frankly, I don't really think any of your statements have a leg to stand on. ;)