It depends whether you're talking about purely making overtaking more possible or somehow artificially creating lots of overtaking. For example, it doesn't matter whether overtaking is easier if the quickest car qualifies on pole and then drives away from the field - that's just motor racing. On the other hand - when a car can be catching another by nearly 2 seconds a lap and then hit the 'brick wall' of the dirty air and make no more progress - that's something that needs addressing in my opinion.