Is "setAcceptableTiles" always necessary?

[maxwade-argodesign]

I'm following the tutorial listed here

Say we declare a level like this:

var level = 
[[0,0,1,0,0],
[1,0,1,0,1],
[0,0,1,0,0],
[0,0,1,1,0],
[0,0,0,0,0]];

is it required that we then call setAcceptableTiles?
My understanding is that all the 0s in the above array signify a walkable tile. If that's the case, setAcceptableTiles would be optional.