You're not wrong fundamentally, but my point is that all of these actions would have various effects on the rest of the economy, and none would exclusively affect billionaires. There's this misconception that if only Bezos, Musk, and their friends paid some taxes for once, we could have single payer healthcare, and that math doesn't math.
Additional business taxes simply get passed on to the consumer in the price tag. You can say it's worth it, but it certainly doesn't exclusively affect the executive suite. Raising the Social Security cap would be a significant tax increase on the upper middle class. I don't have that much pity for them, but there are a lot more of them than a handful of billionaires, and they tend to be pretty important for winning elections. One of Biden's campaign promises was to not raise taxes on anyone making less than $400,000, and this would violate that. Raising capital gains taxes would have ripple effects throughout the economy, leading to less business investment overall, fewer new jobs, and more layoffs. Plenty of normal homeowners take advantage of tax breaks on home loans.
I'm not saying that any of these steps are inherently wrong, and they're all perfectly legitimate tools. But they do have real consequences, and we can't pretend that they don't. You can say that they'd be worth it - and hell - I'd probably agree with you, but the family in suburban New Jersey with two parents in middle management who will suddenly see a big tax increase is probably going to be less of a fan. There is no giant pot of 100 billionaires' money that we can raid without any consequences.