Hey man,
No question in a perfect world what you say is 100% correct however I explained my reasons carefully this method I use is not to square the ends per se from square and round even blanks but finishing parrallel all round before reaming after drilling, glueing, prior to turning. As I already said your ideas are commendable pointing out my take as it affects me.
Please find a few pics of prepared blanks my sanding set up for finish squaring to the hole drilled, the block of wood with the cut off mandrel right angles all round, understand my blanks are cut purely for grain mostly at right angle to the grain these days.
Terry also know it would be very easy for me to give one line replies nod my head perhaps my two fingers dont describe on the computer what I try to share. Thinking of becoming more of an observer every day mate.
Kind regards Peter.