What is the opinion of Reddit about the
Pragma Bed Simple Base Bi-Fold Bed Frame, Queen?

Agreeing with omgwtfishsticks. You’re unlikely to find what you want at that price point. Upholstery and carpentry done BiFL-style are unlikely to be findable for that price unless you haunt antique and secondhand shops and get lucky.

I’d recommend a two-parter. I invested in a sturdy-yet-foldable frame — https://smile.amazon.com/dp/B00F2EVPHQ/ref=pe_385040_127541850_TE_item — and will eventually get a headboard when I find something I actually like.