As someone who does not like flying (I don't like heights), I will miss those planes. The large size makes me more comfortable in one.
With 747s the wings flap up and down quite visibly in turbulence, and you can even see the fuselage twisting if the curtains aren't closed between the sections.
There's also just the wall thickness to mass ratio. You ever notice that you can crash toy RC cars all you want and they never break, but if you crash a real car even mildly it's rather easily totaled?
If you haven’t seen the wing flex in a 737 or A320 you aren’t paying close enough attention. It’s very obvious during the takeoff roll as load is applied or during any moderate+ turbulence.
Sure, but a commercially-sold 1:500 plastic model of the same plane crashing into a wall at 1mph won't be tissue paper.
Similarly, ants can lift 100 times their own weight and survive having 5000 times their own weight placed on top of them, but it's quite impossible to for a human-sized mammal to do the same.
That might not be the best to share to someone who says they are being uncomfortable in a airplane, you're making things worse for them! :D