Why would Brose even try? As far as they are concerned this part is fully fit for purpose. It was in the 1.2, 1.3 and now the latest 2.1 motors.
Brose are happy that in 99% of the bikes this motor is fitted into, it works fine! They would not listen to Specialized any more than they would listen to you or me. If it's a 1% or less failure rate out in the world then that's acceptable.
Remember, there is a big world outside of EMTB's. There are commuter bikes, shopping bikes, cargo bikes etc. And in Europe they outnumber mountain bikes 100/1. So when you factor all this in, Brose failure rate is probably closer to 0.01% with many, many happy customers.
Frustrating though isn't it.