This policy would be fine if you could pick up your bags as you dis-embarked the aircraft. When I have only carry-on luggage, the last thing I want to do is wait at baggage re-claim for my small hold-all when other pax have forced their supposed carry-on luggage weighing 18kg into an over-head locker!
Personally I believe that Easy have too lenient a policy regarding cabin baggage. They should more strictly enforce baggage size restrictions [not weight], thus reducing the need to ask pax to 'donate' luggage to the hold.
Whilst on my rant, why cannot pax realise that putting luggage into a locker 'length-wise' [ie wheels parallel to the fuselage] is just plain WRONG! Sorry - just going to lie down, wheels facing fore and aft!