First of all, as a current Jinx main, I've never claimed Jinx has a weak early game, neither have I ever seen any Jinx main claim that.
She has an avarage early game, she is glaringly weak against being locked down (hooked, stunned, etc) or getting caught but that's not just her early but rather all game.
Jinx is more or less fine, if something she could do with some tweaking and perhaps some small nerf, but straight up hard nerfs would just destroy her.
All her mobility is tied to her passive so while having some mobility she can hardly be called a mobile champ.
She is perhaps the most teamreliant out of all adc's, while it can be argued that flame chompers do give her some ability to self peel, it's hardly in the class of that which other immobile adc's have, like Ashe's or Varus ult.
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She is one of the weaker duelers, especially if she hasn't had a target to ramp up her AS on. Much like Morde used to be extremely sensitive to 1v1 unless he had ramped up his shield beforehand. This makes makes her quite easy to duel with most champs outside of lane.
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Beside Switcheroo, she is 100% skillshot based. Flame chompers is highly circumstancial as a peeling tool and equally circumstancial as a kill assissting tool. They have alot of potential to both allow her to outplay her opponents and equally allows her opponents to outplay her.
*She has literally 0 roaming power, if she get's caught she dies, she can't jump over a wall like Tristana, Lucian, Cait or Graves among others, here we come back to being utterly reliant on her team.
*Her only steroids are the 10% extra damage on rockets and the AS ramp up on PowPow.
- In contrast to Tristana who has a far stronger on demand instant AS rampup and doesn't even have to pay mana to use it. Or Vayne who get's a massive permanent AS boost per lvl and everytime she completes certain components one of her core items.
*She's has no tankbusting steroids, like Vayne, Corki and Kog'Maw on the contrary, until you get LW, rockets will barely scratch their healthbars meanwhile attacking them with powpow is stupidly risky. So again, we come back to the fact the she is utterly reliant on having hear team peel for her and lock her targets down to allow her to do her job.
Seeing as she is so extremely reliant on having someone next to her to be effective, I don't see why there should be an issue with her excelling at fighting with her teammates.
Sure her lategame is very strong but she won't automelt tanks like Kog'Maw or Vayne, and if your squishies are getting struck by rockets during teamfights then they need to learn to position better or your frontline needs to learn to engage better.
Tanks, juggs and bruisers can generally eat quite a few rockets before they start feeling the hurt, that is ofc, unless Jinx is far ahead, but any ADC who is far ahead will melt just melt their opponents anyway, but I honestly believe Jinx is far easier to shut down than alot of ADC's out there, and even if she is far ahead, pretty much any bruiser/apc can duel her. Unlike caugh Vayne.
I also wonder why people consider a champ who's only "skillshot" is their repositioning/denying/juke/chasing/finisher tool, harder to play than Jinx. This has never made any sense to me.
If there are any nerfs to be made to Jinx, (I know myself she can be very opressive when ahead, albeit not as oppressive as Vayne but still very oppressive).
I'd suggest, capping the damage of her AoE crits to 80-85% against champs that get hit by the splash.
Then see where we go from there, it might not be that much but I think it would be enough to make her fall in line with the other ADC's and it would tone down her lategame somewhat.
If this is done however, I also demand that Vayne is brought in line.