Repeat out loud - There Are NO Quilt Police, 25 times.
Everyone has their favorite way - and yes the way Jenny shows and also a method I use a lot with the strip tube ruler (Cozy Quilts) the outside edges of the hst are bias and are the non-traditional way. BUT I haven't had any issues and I love not having to trim my hst again. So Use The Method You Like as long as you aren't having issues and are getting good results. P.S. I do starch my fabric