There are plenty of options to get data from live.grid, but the ones to set data are rare.

For example in matrix mode the only way to set the state of the matrix is to specify (x,y,state) for every position. This is difficult to parse and format in a patcher and has quite a bit of overhead. A setrow method would be nice to have I think, similar to getrow, where you can just specify the state of a row by passing a binary list (setrow 4 1 0 1 1 1 0 0 0 1 1 1 1 etc).