It all started with Boeing giving new lease of life to the 737 with NG series instead of the 757 which led to Max and subsequent disasters. B757 could have been shortened to make smaller version equivalent of 737 800/900 or Max 8/9/10, fitted with any engine they want. It would have been better aircraft than lengthened airbuses. Any customer loss would have been recovered in next 10 years. If they abandon the Max10 it's not something that will be missed. It brings with it extendable undercarriage which will have another NNC "In case the gear doesn't extend then:
1. xxxxx
2. xxxxx
Or like the MCAS find it out yourself.