That sort of thing can happen in extreme situations. Zimbabwe and Weimar Germany are the most prominent examples. Both examples involved not having enough stuff. When there aren't enough necessary goods to buy and people have plenty of money you're going to get inflation. Using the right combo of subsidies, government run production, purchase quantity limits, reserves, vouchers, and price fixing you can ensure the supply is stable and eliminate inflation even if there's lots of money.

That's true. That happens because people are stuck in the narrative of the government needing a balanced budget, just like a household. It also happens because the owners and the corpos use all their money and power to ensure workers pay taxes and thus decrease worker money and power.

Yeah, if the population was educated on MMT the ability to bring corpos to heel would be significantly increased. People arguing for it are fundamentally arguing for a change in how we think about money.