Hi Stadjer,
thanks for writing. I see your point. Out would be a trade off; instead of the small wheels and wobbly frame, you would have normal sized wheels. I think you don't that the wheels in the pictures could be good wheels. What if they did roll well, what would you think then?

I've ridden a few folding bikes and I didn't find them to have wobbly frames, but I see your point on compromises. The bikes I rode were definitely compromises as you say.
There are three designs in the original post. If they could be made so that the ride was compromised, then what? If it doesn't ride well, then I totally agree with you that the solution doesn't work.

I agree too that folding bikes should be aiming for ease of carry. Compact size is also important for some people who need to fit it in cars or on buses.

Hypothetically, let's imagined one of these designs worked .What would it take to convince you it works?