I have no idea of the facts in this case, but based on how organizations function in general, one possibility is that the redundancy issues of MCAS were raised internally by some engineers without result.

In that case, the engineers were probably not thanked internally back then and are probably not thanked now either.

If their potential concerns would had led to changes on the MCAS design they would probably not have been thanked either, but rather seen as the people who unnecessarily made the project more expensive or less profitable.

In conclusion, people who avert or try to avert risk are seldom proportionally thanked in organizations in general.