Any communities where you have a critical mass of people with spare fucks to give about their neighbors' power equipment is already rich enough that most people are going to have landscaping far in excess of the bare minimum because they can afford it and they like it or feel obligated by social norms to do it, basically the same bunch of reasons you find 2-child households owning 4Runners and people who barely cook owning a bunch of fancy cookware.

Lifting a ban won't do squat because it only affects a tiny minority. The only reason the laws and HOA rules even exist in the first place is because most people in the effected jurisdictions already kept a lawn and so nobody cared to raise any opposition when the jackbooted types wanted to force the few nonconformists to conform.