To CCP Z:

[Progression]
I would prefer if dropsuit progression wasn't so centered around upgrades but sidegrades, so you would unlock suits that gain a big strength, but at the cost of a weakness.

Examples:
Instead of unlocking even better assault suits in the assault role tree, you can unlock a new skill to use a new specialization with no grenade, less slots, & less speed than an assault in exchange for a bonus to range & zoom, as well as inheriting the assault bonuses (call it the marksmen).

Going deeper in the logistics tree grants you access to a new specialization with less slots but has built-in E-war equipment. Would inherit logistics bonuses in addition to bonuses to the E-war equipment (call it the engineer).

Going deeper in the scout tree unlocks a new specialization with only one equipment slot, less modules, but 2 sidearms (or 3 sidearms & no light weapon); in addition to inheriting the scout bonuses, they could have a bonus to sidearm damage & racial knife fitting (predator or assassin).

Going deeper in the sentinel tree unlocks a new specialization with less slots, penalty (or restriction) to fitting light weapons, but in exchange inherit the sentinel bonuses in addition to racial heavy weapon damage (sentry).


[Roles]
Dust 514 has had a very limited and boring set of roles. It was fairly recently that we got the commando, which added some spice to the formula, and there are promised roles we are still missing: there was a role mentioned by CCP called the commander or crusader mentioned by CCP that was supposed to give area-of effect bonuses to teammates, and penalties to enemies (like rate of fire reduction). There is also the still missing pilot suit that was supposed to give bonuses to vehicles.
Despite the game's lack of modes besides just the basic archetypes, you want to remove the commando? I implore you to not only keep the commando, but to also expand specializations into a wide variety of options with various specialties (like that area-of-effect specialization CCP never added).

I like a lot the sidegrades idea and that is something that our Design Team is currently looking at (more or less modules, different weapon types, different abilities like being able to hack or not ...)

The current default Assault has two light weapons. Commandos haven't really been worked on yet, but if they stick around it's likely they'll have a new role.