Reducing all the nuance of Marxism, socialism, and communism to
“from each according to his ability to each according to his need”
is problematic.
It’s not going to lead to much explanation and it ignores the hundreds of thousands of other words that Marxists have written.
This is in addition to the problem that “from each according to his ability to each according to his need” is the goal of communism and you’re arguing with someone who (rightly) says communism hasn’t been reached.