Would you have no limits on any domestic development?
At the risk of opprobrium, I would agree with that. Many would retort: 'then how would YOU like a 20-foot 2-storey extension adjoining your back garden?' Personally, I wouldn't bother as long as it satisfied structural and fire-safety issues and was not a danger to my property (ie conformed to Building Regs).
But if ALL planning restrictions were lifted, I suggest that large extensions to existing houses would not necessariy follow. Land would become so cheap, and houses far more plentiful - and cheaper - it could well be easier to move to a bigger house rather than extend an existing one
Whilst I hope the amendments to the GPDO take place, the Government is merely tinkering with an obsolete and useless system. Perhaps a little more radical thinking is called for.