The Frumguy, taking “ein od milevado” literally is not at all universal. On the contrary, this was the main point of difference between chassidim and misnagdim, and it goes two ways: The GRA and those who followed him held that tzimtzum is meant literally, and therefore “ein od milevado” is not to be taken literally, whereas chassidus held the opposite, that “ein od milevado” is meant absolutely literally, there really is nothing but Him, and therefore tzimtzum cannot be meant literally.
Chassidus taught that Hashem did not really contract Himself and create a space where He is not, but rather tzimtzum means He created us unable to perceive Him, so that we are under the illusion that we and everything we see is real and He is not real, when in fact the exact opposite is true, He is real and everything else, including ourselves, is not real.
The Baal Shem Tov’s view of hashgocho protis follows from this. If the world is real then there is room for the rishonim’s view that most things happen by themselves, and hashgocho protis is only for important people or events. But if there is literally nothing but Him then it follows that nothing can happen without His directly making it so.
This was all revolutionary 250 years ago.