The idea that these Force of Wills stops "broken" T1 plays is completely false as many of those decks play Force of Will themselves. Force of Negation has a built in fail safe from being able to be played in those scenarios as it is only free on your opponent's turn.
The idea that a "support" card can not be broken is also completely false. Mishra's Workshop, Bazaar of Baghdad, Ancestral Recall, Black Lotus, and many other broken cards can all be classified as "support" cards since they don't actually win the game on their own. Most decks consist of a collection of "support" cards with a handful of "win conditions". Continuing down the path of restricting every decent win condition in favor of these other clearly degenerate "support" cards has left Vintage in a state of constant turmoil. The rotating eternal format.