The big thing in a real plane is you can have you hand on the trim and the controls. Unless you are flying a Kraft Signature,Ace R/C or a Proline from the 80s you cant do it. Also if you had to do a go around or touch and go the plane would be out of trim at a high power setting; also at reduced power it is more natural to modulate up elevator. Digital trims you could do a quick 2 click to help but manual trims like most trainers have would have you concentration in the wrong place.