Are these shoes really necessary? I am researching this cause I am thinking of epoxing my shop floor, 2000sq ft
They are not absolutely necessary, but with 2k ft2 you really, really, ought to have a pair.
In fact with any size floor if you're going to use flake I'd get the spikes, w/o flakes, and a smaller floor, you might not regret having them, but a medium size space, or with flakes - get the spikes.
Even with a small floor with no flakes I recommend spikes if you're going to do a clear coat. I've had several customers call and say the project went great - until the last step. After the clear coat dried they could see a small spot or two where they missed applying the EnduraShield clear coat. Reason is that when the apply the Endurashield the LiquaTile still looks very wet, and the EnduraShield is crystal clear, so it can be difficult to see where and where you haven't rolled out the EnduraShield. Having the spikes will allow you to quickly walk around while the EnduraShield is still wet and spot any "holidays".