Why are they taught to do it that way? - because it's done like that all over the chain. It's ridiculous. I thought I was the only one it bothered. Guess not.
But the maids who make up the bed with the pad in big wrinkles underneath the sheet get my ultimate boobie prize in the housekeeping department. That's much too common.
OTOH, the actual beds (crummy foam mattresses and all) don't usually bother me. Hilton beds now - there are Hiltons where if I stay 2 nights, by the second morning, I can't walk . Different strokes, I guess.