The problems they listed are unsolvable, but you have apparently lacked the intellectual curiosity to investigate why the supposed solutions would not actually work. I won’t debate the basics of the impracticability of Marxism in large and interconnected societies with you because it will take too much time and effort, and I have no way to know if you’re genuinely interested or just another troll.
See, others can do it too ;)
Person A and person B have to do the same exact task e.g. fix a car or whatever. It takes person A one hour to do the job. Person B is more skilled and experienced, and thus can do the exact same job in 30 minutes. Correct me if I’m wrong, but by your logic I understand that person A should be paid double of what person B is paid, because they gave double of their equally important time. One could argue that since it’s the same job being done, they should be paid the same. I would argue person B deserves even more pay for the exact same job that person A did, because they SAVED time. I agree time is valuable, thus doing a job faster is more valuable than doing the exact same job but slower.
Non-ironically: the fact that it’s not liked by groups of people capable of sabotaging it. For example, is the USA at fault for the embargo on Cuba and all the hardships it goes through? Yes. Is it still a problem for people living in Cuba? Also yes.
Unfortunately, some things may not be your fault, but they are your problem. And as long as there will be entities who don’t like you and are able to make your life worse (so basically forever as long as there exist powerful non socialist nations), that’s a problem you have to deal with.
And I don’t say this as a critique of socialism itself, yet it’s still a downside of it. Unfortunately, being liked by the bullies is an advantage and not being liked by the bullies is a downside, since they will bully you. And at the level of nations, there isn’t a bigger authority you can go to. It’s just school kids with bullies but there is no supervisor teacher. You could make the bullies unable to bully you by either becoming stronger then them or banding together with others who are against the bullies. But just like in a street fight, playing dirty is an advantage, so the bullies are at an advantage.
Again, this is not the fault of socialism, but it is one of its problems.