Remember, coming out with something new is FAR more important than coming out with something better. Sad but true, manufacturers have learned that doing something new, whether it's not quite as good, or as good, or better, will generate interest and sales. So many just keep spitting out new things, often with no logical progression apparent. One motor, then one motor with multiple pulleys, claiming progress. Then one motor, no extra pulleys, saying that's simpler and better sounding. Then flywheel. Then no flywheel. Then rim drive. Oops, then the "best we've ever made" comes out with no rim drive. Now direct drive.
If you think that represents a lack of clear thinking proper research before putting things out, don't be fooled. It's very clear thinking - ABOUT MAKING MORE MONEY!
More changes, more self-proclaimed breakthroughs = more sales to the guys who always fall for a new idea, always hoping for progress, always believing new is better.