Well, sure. Give or take creep. But down at 1 mm^2 say, that's all of 8 lbf, or 40N say. That's not much, I can pull that with one finger.
And maybe you want the safety factor to be 4, so it's barely enough to hold up, oh Idunno, a modest size transformer or something? Factor could easily be 20 or more to account for mechanical shock. Plus twisting/bending moment. Clearly you'd want a stronger joint than that, and more contact points to distribute the load over. Something like a PCB, doesn't have nearly as strong laminate/peel strength anyway, so you need quite a bit of soldering area, which is, well, how we normally do things, so there's that.
Anecdote: the bracing on my homebrew LED strip, that I have hanging over a closet door frame, started to look dangerously loose over the last couple of years; I finally took it down and redid the joints this year. It was... how to put it, something of a tee joint, between two pieces of copper clad, one flat (base board), one perpendicular (the brace), with maybe a 5mm-long solder joint at the base on both sides. The brace was subject to some leverage, as it sits at an angle; it was clearly pulling out of the solder joint and had displaced by several degrees. This is over a good ten years or so, and fabbed with Sn63 solder. I put it back up by doubling up on solder joints (the brace is resting against a cross-member that it previously wasn't soldered to), and adding another brace (a square to reinforce the cross-member from the backside, to prevent it bending). At this rate, and given the reinforcements, it's probably good for 20 or 30 years, in which time the power supply, and probably current set of LEDs, will have long since expired.
Tim