Glossy consoles were also more durable.
Agreed, the 80's consoles...most notably the 84-89 era...were the most durable Maytag ever produced and they age very gracefully.
As noted above, the buttons on the 66-79 center dials would yellow under the wrong conditions and the lettering on the buttons would wear under high use or from the OCD housewife. The console paint from 1957-1979 would easily wear through with too many cleanings, aggressive cleaners, or just a hint too much scrubbing. The early 90's flat black consoles didn't wear very well and were prone to fading, especially if pretreatments of garments were sprayed near the console. Some consoles of the white era of the mid 90's to the end of production, especially the grained hard plastic surroundings, would yellow overtime.