Hi Icarus, many tanx for your kind and attentious explanation.
Yeap, maybe i used the word "ton" in a "too much metaphoric" way, so please accept my apologies regarding that lil grammar typo (maybe b'cause english not my mother language).
However i've been told that almost all Ryanair fleet of 738s (wich are pretty big, lets say around 450 planes nowadays), and even other LCC using NG 737 are not equipped with that option on the cockpit displays ('i ve seen it too during some flightdeck visits). I dont know about their future MAX, but a great portion of their present 738's dont have it. (maybe a kind of optional, as also in other operators).
But as you wisely and correctly said, theres a fine line between normal day procedures and those coming out from the MROs and similar.