Increased CC-duration penalty is already tied to certain LLC gear.
This would cause your health to constantly go down, virtually like having a permanent DoT.
You’ve never seen my tank Orendi or El Dragón build 
Agreed, even though this is a rather broad and vague wish.
Agreed. Buildables, different enemy types, stationary Battleborn to name a few things.
Agree as a principle, but I’d certainly reduce the duration given the plentiful CC going around, especially various slows. Probably to 7 seconds, that should still more than enough to get use out of it.
Agreed. They ought to increase the duration for secondary effects which requires you to respawn and buy buildables as well, 120 seconds & 60 seconds respectively for instance.
Somewhat indifferent, I don’t think the price needs to be dropped. When the gear of the respective rarities are flawed, they get a reduced price of ~28% for Epics, ~38% for Rares, 42% for Uncommons and 100% for Commons. Making those numbers more equal to one another (new exception being Commons) could make sense in my mind, but I don’t find unflawed Uncommons to be overpriced.
I take it we’re talking PvP here, in which case I’d just like them to be perma-banned to be honest. It’ll make balancing PvP easier and legendaries can actually have legendary worthy effects which could be really fun in PvE. After all, barring the lore legendaries, it makes sense that legendaries obtained in PvE are PvE oriented.
While I agree in point, and do wish they’ll resolve it ASAP, there’s a part of me that likes it since you rely heavier on a balanced comp.
Am indifferent here, don’t think it’d be too much of a game-changer in competitive games. Not to say that it can’t be, just not to a high extent.
I’m not sure. I’d like for them to re-add the shard by the sniper ledge overlooking doubles, but the shard clusters in the middle is just another carrot to encourage players to try and push out and break out of the base instead of continuously turtling around the chokepoint.
I’d say Rare or above, guaranteed legendary from Rendain when running Advanced.
While I realise that it’s an alternative, it still undermines the challenges themselves. Sure, they don’t appeal to everyone, but that’s not necessarily an inherently bad thing. Re-adjust the challenges maybe, sure, but not an option to overlook them.
Seems like I can’t quote more 
Anyway, personally, I can think of these things on top of my head (besides what I’ve said above);
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Op-specific Commander packs (from 100-point runs) are guaranteed to drop a legendary.
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More refining of geometry of certain maps, such as the staircases on Monuments & the parallell staircases on Echelon for instance.
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A redesigned statistics section. New interface, distinguishing PvE & PvP stats, allow to share with specific players or friends, character comparisons, more variables (most minions killed, average damage dealt, average accuracy etc.).
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A redesigned gear section. Allow an overview of all loadouts at once, ability rearrange them & clear distinctions betweem gear archetypes.
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Default loadouts for specific characters.
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A customisable “Random” character button, which will grant you a random character out of the ones you select. I.e select 7 characters and the randomiser will select one of those and ignore the non-selected characters. Then also have a marking indicating which players randomised their character and how many characters they randomised between.
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Selectable, potentially even customisable wallpapers for the logging in screen. Choose character, pose, skin, background, placement etc. and set a rotation of the wallpapers you want.
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Re-instate the showing of both levels and pre-made bars in PvP matchmaking.
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A 2-3 second window where you can regret a helix choice given that it was not utilised. Wouldn’t work on everything, but would help a lot nonetheless.
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Ability to trade characters with other players in regular draft.
Those are the things I can think of now, may’be forgotten something.
Some small things amd not-so-small things!