Avionics is the area that is the
least tolerant of radical redesigns in human interfaces. This FMC form factor has been around a long time. There
are newer ACARS/FMC systems that have an actual QWERTY keyboard.
https://www.aviationtoday.com/2016/04/27/spectralux-launches...
Remember, also, that not all countries use QWERTY. France, one of the homes of Airbus, uses AZERTY. What should they do about their keyboards?