I would say that Jill Stein's platform is broadly impractical. It's largely a wishlist of "things that would be cool if they were the case" generally bereft of "how it will be acheived" and ill equipped to deal with harsh realities.

The most pervasive issue is her platform asserts that it will do things that are beyond the authority of a presidential administration. Much of what she promises are the responsibility of congress, not the executive branch. She promises ranked choice voting but that's not even the authority of the federal government, that's the states. She even goes so far as to declare that foreign nations would basically act the way she tells them to. Meanwhile the Green Party despite fielding a presidential candidate is utterly missing in enough down ballot elections making it a guarantee that such a hypothetical presidential win would be lame duck from inauguration.

There's also some inconsistencies. Like allowing the UN Security Council to hold Israel Accountable, but at the same time wanting to abolish the UN Security Council.

Then the flat-out bad ideas, like disbanding NATO. Her platform reads like she believes Russia would just be nice if NATO didn't exist, that the US and NATO is the cause of the invasion of Ukraine. Maybe there was an opportunity there in the 90s if the world had helped Russia differently in the wake of the USSR collapse, but that opportunity, for now, has passed. Fairly sure if she had her wish that we'd probably see Taiwan fall to China, South Korea fall to North Korea (with Chinese and Russian help), and Russia take much of eastern Europe.