I can think of three possible reasons why not, all equally likely: 1- no one has bothered. 2- it's been tried, something terrible happened and now they don't

I can think of three possible reasons why not, all equally likely: 1- no one has bothered. 2- it's been tried, something terrible happened and now they don't try it anymore. 3- it's been tried, but the extra cost doesn't cover the extra benefit. No one wants to pay for it. All that said, I was at a hotel once that had, to my mind, perfect acceleration like you describe. No one else cared, but I was blown away by it.