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.
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.