I think it is great that British airports are relaxing their rules, but until that applies to the whole world, I will still arrive 2-3 hours before departure, knowing how unpredictable the situation at some airport security checkpoint can be.
It is almost as if the whole point is to discourage us to fly. It is great if you live in a country with access to high speed trains. Surely beats walking around in your socks or people with no empathy going through your luggage.