huh?

I am not seeing any connection between "most of us are carrying 3-4 pieces of equipment"
and "logistics do require the extra slots".

It in fact makes the case that logis should have LESS slots.
Theres supposed to be limited space for tech in a suit.

The more of (X) you have, then the less space you should have for (Y).

If logis have more EQ slots, they need to have less other type slots.

Okay, if you want to argue "they lost a sidearm slot for the EQ slot", thats fine for the first extra EQ slot. but then where's the rationale for gaining the second, for the ADV suit?
There needs to be a corresponding additional penalty compared to the other medium frame suits.

Similarly, there is ZERO justification for having MORE slots than assault suits?!?!?

Having the same number of slots, is kindasorta understandable. But no way is it justifyable to have MORE slots.

How is not allowing logis to fit more health/damage than assaults going to screw them? Why does it even make sense that a support character would be able to fit more health/damage than an assault character?

That....doesn't really seem to make sense. I understand that support characters have to do support things. But why do they need more health to do support tasks? Why do they have to be on the literal front-line to support their team? They can't use a rep-tool or drop a nano-hive from behind the line of fire? You're saying they need more health since they aren't shooting at people, but doesn't the opposite make more sense? That the people actively engaging in firefights need more health and damage output? Because that's kinda their role on the battlefield?

Yes, obviously an assault suit will have an advantage with a logi at their side, but that doesn't mean the logi needs more health than them. Maybe the same, sure. But definitely not more. What I'm saying, is if you're firing your rep tool at a squad member, just stand behind them while you do. Don't put yourself in the line of fire, because you're the support guy, it's not your job to take the hits.

I never mentioned the ranges of equipment, so I'm not sure why you're bringing that up. Like I said, just don't be on the literal front-line if you're a logi.

There's a slight logical error with your last paragraph. That idea wouldn't make logis do less damage; they would do the same relative to other suits, assaults would just do even more damage.

My biggest issue with buffing assault suits is that it will raise the overall power scale of this game even higher, and leave heavies and scouts even further in the dust, which isn't really something I think is a good idea. But I still don't really get it, why do the support guys deserve extra health at all? What's the logic exactly?

Yes, flanking is an effective technique if preformed properly. This is already true, and I don't see why adding a level of depth to strategy is a bad thing.

I was under the impression that logis gave up assault suit qualities in exchange for being extra good at supporting other suits. I still see no reason why the support character should out-tank or out-damage the assault character. The benefit of choosing them is supposed to be (at least in my understanding) those bonus equipment slots, solidifying their role as the support unit. Of course, the current logi suit bonuses don't really lend to this specifically, and I would also love to see them changed to be more beneficial to equipment use (something CCP has also said they'd like to do).

For the record, I'm also very for removing that 10% damage from weapons and giving assault suits your suggested bonus. I just don't see any actual logical reason the "healers" need to have more health than the frontline soldiers.