I’m going to take a guess and say he has never designed an electrostatic, and enjoys the Planars. He knows them, has been doing them so long he can probably guess his measurements before he reads them. He knows Planars and I’m pretty sure he could build an electrostatic better than most, but like anything the more he worked with it the better he would get , and he’s already put the work in on Planars. Just guessing really. Like a Ford & Chevy thing