I haven't done all hexes, but I did a Jack's chain which is hex, triangle and square with entirely set in seams. Each shape finished at 3" on a side.

I machine sewed each seam and left a generous 1/4" unsewn at the beginning and end of each seam, just as if I was hand sewing. I wouldn't have wanted to do it with hexies that were smaller than 2" on a side.

Years ago, I made a template and punched holes in the corners. Then, I put a dot in that corner. Next, I sewed the hexies from dot to dot. They fitted together just fine.

Great look. And a great time saver, too. Well done ladies.