translation: his greatest achievement has been not being Trump
No, the achievement was actually winning the election. Unlike Hilary for example.
No, it doesn't. First, changing constitution would be impossible. Two, even if you did all this it would just make right wing states get even more extreme (there's nothing in the plan that would let central government protect human and constitutional rights in red states).
Unfortunately US political system wasn't designed in a way that let's it change with time. To introduce big reforms like this it would pretty much have to collapse and be rebuild from scratch. Realistic way to make things better is simply organizing locally to inform/educate people about progressive/socialist policies, electing moderate/progressive politicians to take over Democratic party and simply creating a political force that can actually oppose Republicans instead of trying to comprise all the time.
No so long ago it was generally accepted that Republicans will always be a minority party. They managed to take over the government though smart PR, well organized (dis)information campaigns and long term, bottom-up work to take over institutions. Now Democrats have to do the same.
Brexit was the perfect example of how this works: one direct policy change, clear predictions from experts what will happen, clear statements from EU, clear success/failure criteria (better trade deals, stronger economy). 7 years later if couldn't be clearer how complete failure it was but the party that did it is still going strong. Their excuse? The idea was right but the execution was flawed. Also it's still better then what the other party would have done.
It will be the same in Argentina. Whatever will happen they will simply claim they did the right thing, it's their opponents sabotaging their work that responsible for the failure, it would be even worse had they not done it, they are the only ones that can fix it. People expecting that everyone will just agree that what they did was stupid are delusional. It never happens.
AOSP. Sad but true.
When first pinephone came out I really believed it's heading somewhere. It thought that it will be kind of like raspberry Pi (fun, cheap platform to play with) and that we'll quickly see copycats and it will slowly grow the way Linux on desktop did. AFAIK nothing like this happened. You still can't get a phone with decent Linux support which for me shows that we're stuck with android. I think most people that would help Linux phone happen are simply satisfied with LineageOS so there's no incentive to put as much effort into it as it requires.