i make bespoke sash windows by hand, the old fashioned way, planes and chisels, wedges and dowels. i could buy a machine to do it all for me, i found one that could make a sash from stock timber in 8 minutes, but i can gaurantee it wouldnt last as long or be as good quality because machines cant 'read' the material, spot how the grain is running or account for flaws such as knots in the timber.
im sure this is the advantage of hand made over mechanised, being able to control the quality of a process.
i taught myself from my grandads old books, dating back to 1930, and im forever repairing more modern machine made windows because they just dont last because they werent made right in the first place. the oldest window ive restored was 270yrs old and is still in use in its original condition today, but the amount of 30yr old windows ive had to rip out and replace is what keeps me in buisness.