Customers face a big scandal, so called "Keyboard-Gate".
iFixit proofed, what is the following: Grains, condensing dust will be gathered at the edges around (tent effect). Then through transportation (vertical) or movement away from horizontal line, these grains will arrive at the corners and will fall by gravitation through the 4 "entry holes" and enter the bottom space (this will getting worse with thermal influence e.g. sun on keyboard and simply usage - also I expect that this membrane will stay up at the inner side of these "entry holes" and will be pressed down outside, which leads to a sinkhole effect). Then dust grains will condense and be pressed by the butterfly arms with each typing till contact is lost (lack of "cleaning by gliding" at the bottom, as it was done by the previous mechanism).
Especially the handling of repair for MB and MBP 2015 till 2017 is a heavy beat to customers.
Now we understand the arousing thermal problems of brand new MBP with Touch Bar, we heard about - circulation was heavily reduced by this membrane... (this could not be counted in establishing the whole concept).
What now, Apple?
First push the icons away of their throne (Jony Ive and the engineers of butterfly mechanism) and work out a completely new concept for the current Mac Book and Mac Book Pro line - fastest as possible.
Too much for professional computing gathered in a row:
"Keyboard gate", thermal problems with slowing down CPU, swollen battery, short battery runtime, lost MagSafe...