A major con of bedframes is annoying squeaks. Joints bear a lot of load and there usually isn't diagonal bracing to speak of, so they get noisy after almost no time at all. Fasteners loosen or wear the frame materials. I have yet to find one that stays quiet more than a few months or a year without retightening things; but I haven't tried a full platform construction with continuous walls which I expect might work better, but also sounds annoyingly expensive and heavy.