I think the biggest problem for the airlines (not the pilots), is that it won’t get certified as a common type with an EICAS, which, in turn, makes it pretty useless for them.

If it did get a common type, the safety threat wouldn’t be flying the 7/10’s (the poster above is right - an EICAS is idiot proof), it would be going from that back to a 7 or 8. Some theoretical airline 10 years from now could be fly exclusively MAX-10’s then suddenly get a good deal leasing a few MAX 8’s. With a common type, the company could just toss the pilots a CBT and say “Don’t worry about it, this old alerting system is just the same”. That’s the scenario where I see a safety threat (if there is one).