I think those last two are in direct conflict. The federal government provides a lot of valuable and value-added services to a lot of people's lives. Slashing government spending a la DOGE disrupts that value. We've seen the impacts of that already in public parks, weather forecasting, air travel, etc.
And after all the cuts, there will be something like 10-20% lower taxes on average, but most Americans will see perhaps 1-5% reduction in their tax bills because the savings will go to the ultra rich. Musk doesn't know anything about the benefits the federal government provides for a typical citizen and will get rid of too much, disrupting lives in the process.