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A couple more thoughts (Yes this is a topic I've spent a great deal of time thinking about and researching)
On folded designs, they are mechanically complex and fiddly to collimate - Unless they are very rigid (and therefore we are back to heavy) the design breaks down. It might be the ideal way to have a very large dob if it didn't have to move around though and keep feet on the ground.
On the final point about not needing ultimate quality, I actually think this is a misnomer. A small scope with a better quality image ultimately leads to better contrast and the ability to see very faint details. Big but crappy light buckets are superficially impressive, especially on objects which are already bright - but when you get to the limit they start to break down.
My 16 F4 for which it seems I got pretty lucky with a very good mirror often out performs 20s and even 25s which only have middle of the road optics when seeking threshold objects (~Mag 15 galaxies etc)
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