Just because one company can't build a machine, doesn't mean every machine of that design is bad.

My last car was a piece of crap. The axle bearings kept seizing up. I don't want my next car to have axle bearings. See the failure in that logic?

There are plenty of printers that use belts, and they work just fine. There are lots of printers that having moving Z axis beds that work just fine.

I know some have frames made of wood, most have aluminum extrusion. I wouldn't even consider buying a printer that has plastic supports.

Auto leveling is a nice feature to have, but also having a dial indicator in your toolbox to really level your bed is also nice.

There is a reason god invented zip ties.

But all that said, there is probably a machine that fits your criteria. A home built Delta printer would probably do ya, but they have their own set of limitations.