i prefer foundation piecing my logcabins blocks- (i use a muslin foundation-so i don't have to remove paper) cut my strips to the width i need them & leave them long- or sometimes i cut them to size ---just depends on the project & my mood i guess- either way works fine for me. (generally the Judy Martin technique)...better accuracy
foundation keeps everything from getting wonky- adds stability- and some weight (an extra layer) to the quilt- helps keep all those seams secure- especially helpful if using thin strips---like 1 1/2" or less---wider strips don't need the foundation as much.