Dude, really?
Apple has an ENTIRE BUILDING for the Quality Control department. They perform alloy corrosion tests, metal torsion tests, screen burnout tests, dust and humidity sealing tests, and dozens of others. They have machines that press keyboard keys millions of times, with multiple levels of force, recording average life expectancy and durability.
Trust me: they KNOW.
Furthermore, this is gen-3 of this butterfly design, which was launched 2.5 years ago. They know it inside out by know, both its strengths and weaknesses, as well as the thousands upon thousands of user complaints and repair requests they've received from gen-1 and gen-2...
OF COURSE they know that their butterfly keyboard is fragile and prone to failures. Why do you think they released the Free Keyboard Repair program last year for gen-1 and gen-2? Why do you think they have added the silicon membrane on gen-3? Why do you think they have had to release 3 iterations of the same keyboard design within 2.5 years? They KNOW of its fragility!
Apple is doubling down on the butterfly design, even though it's prone to failure. If gen-3 starts failing as gen-2 and gen-1 did, and threads like this start popping up once again, they will ultimately have to give up on it and come up with a whole new design.
BTW, the same thing has happened with the Touch Bar. It never materialized its potential and Apple has already cut it out of the MBA, and it never included in their Bluetooth keyboard for the iMac. It was a bet that didnt pay off, and the butterfly keyboard seems to follow the same path.