a) You were happy to settle, which sounds understandable. But when the stakes are $44bn and most actors on Twitter's side are but agents for Twitter shareholders, their chief concern will be not breaking their fiduciary duties if they accept anything less than the maximum amount they could get. It's a bit hard to imagine how the legal bills for seeing this through could stack up to even .1% of the purchase price ($440m), and that's nowhere close to the discount that Musk will be looking for (with good reason imho, btw).
b) In your case the other party might have gotten away with dodging a court order to pay (or at least made it appear like that). That's pretty much unfathomable if you are literally the richest man on earth and live in the US.