Given the nature of the ABF operation - hub & spoke, daily pkg sorting window, timing is everything - reliability was a major issue. I am not sure if the glass cockpit would drop into the beancounters' DOC bin, but it was apparently a big issue for them.
To be honest, I do not know if it was finally adopted; I only know that they had one glass bird (20 yrs ago) flying with an Experimental tag. Even if it were an increased DOC, if it provided greater earnings (lower refund & reputation losses), it might have been seen as an worthwhile upgrade.