Whirlpool designed and built 27 inch wide dryers
These were introduced around 1988, whirlpool's of course still supplying all the laundry appliances for Sears and seers ask whirlpool to come up with a dryer that was narrower so that they didn't lose sales to GE Frigidaire and other makers that had smaller dryers, the other design concern is they wanted to dryer that could be vented in all four directions down back right or left both gas and electric Nobody else had that at the time.
Whirlpool has produced many variations of this dryer when they started selling front loading machines they matched the 27 inch dryer to the front loading machines.
This has been an excellent dryer mechanically and performance wise since the beginning, another important criteria of the trier was to get the heating element further from The clothing for greater safety, these 27 inch dryers have four rollers under the drum to support it as a result. You almost never see a bad roller on a 27 inch dryer because of the even support. The 27 inch dryer was not copied from anyone else, some people think it looks similar to a May type, but Maytag uses poor quality slides at the front ride directly on a painted drum. They use plastic blower, housings, and plastic in our doors, it's not the same dryer at all.
GE usually still puts their heating element behind the drum a much more dangerous design. They also use a cheap little plastic bearing in the center of the heating element, great design and a plastic support at the front of the drum, which is the biggest service issue on GE dryers to this day.
As far as durability of the new 29 inch dryers yes the timer that has a plastic shaft has had some problems generally in life some things get better some things get worse, note the plastic shaft is not breaking. It's just a different time or design and they generally suffer contact problems inside the timer has nothing to do with turning the timer too fast or hard.
I have seen no reports of heating element problems being any more frequent on 29 inch dryers or any other problems for that matter. It's still one of the simplest and best performing dryers for the money.
John L