As a first-time RV owner when I bought my PC in 2019, I had no reason to know anything about slide-outs despite a long background with mechanical and electrical things.
Consequently, when I experienced my slide problem this last summer I spent quite a bit of time online getting some background on slides in general and the new Lippert system in particular. Although I still have no direct hands-on experience (which is by far the best way to learn), what I think I've learned is that the twin-motor/two-shaft/four-gear Lippert system is a very lightweight unit that likely requires a careful installation with close tolerances for long-term reliability. I can see why it is attractive to manufacturers--it adds minimal weight to the coach and is low cost. Properly installed, it will handle even the big whole-wall slide-outs, but it is not a very forgiving system. It's definitely not a "heavy-duty" type system that man-handles the slide. Standing alone it is spindly and wobbly and relies on the attachments to the slide and the coach to give it stability and structure; the racks are shallow and tooth engagement is minimal. If the slide box is well-designed with a close tolerance fit and stable structure and the coach walls don't flex, the Lippert will reliably move the box in and out for extended service. But that's all it does, is move the box--it won't carry the box, or force the box, or power through flexing tolerances in the box or coach walls. It relies on proper design and installation to work reliably long-term.
That's what I think I've learned about the Lippert system that my unit has. Maybe someone with that valuable hands-on experience can correct or better explain my assumptions.
Mike