IIRC this isn't true. Non-W2 earners are supposed to do quarterly taxes.
> and often times they're missing a piece of it.
This is kind of a bigger problem, no? If it gets to the end of the year, and so many 1099 contractors don't have enough to pay their taxes that it is actually an issue for the IRS, it strongly implies that those contractors didn't understand how much money they were actually making after tax (and thus, didn't put enough aside). Contractors not understanding how much money they are actually making (in relation to the W2 option) is not a good thing.