With all due respect, I think you’re missing the point of unsolicited redesigns. They are fun design explorations. No brand requirements, no product design restrictions, no insider information that would shackle ideas. No “this is the way we’ve always done it” debt, just pure exploration.
There are a bunch of assumptions in the first paragraph, but I understand your point and agree it sometimes rings true.
As bystanders, though, we can choose to be inspired by the entire design, certain parts, or none. If a designer really thinks he knows better and understands the actual company goals, we can disregard that…
An important conversation for sure, but to follow this line of thinking could pigeonhole sites like dribbble into sites for design critique rather than random creativity. That would be unfortunate.
Don’t fall into the trap of assuming something has no value just because it doesn’t fit your own mental model of how a “real-life user flow” ought to work. If it doesn’t help YOU, instead of arguing, just take solace in the fact that not everyone thinks like you and move on.