Malaysia Airlines has moved away from piece concept to weight concept effective May 1, 2017.
This means that you can check as many pieces as you want as long as you don’t exceed your total weight limit.
You can access Malaysia Airlines web page for baggage here.
Here are the limits:
Here are elite extras:
It is bit confusing what are the benefits for Oneworld elite members. It says that the maximum piece number is two when there shouldn’t be any as long as you don’t go over the total limit?
I would say that overall this is better for most travelers. You can check in more than one piece (as many pieces as you wish) when you don’t go over the limit set by the ticketed travel class + possible elite status extra.