Q. Do you do a written W&B before every flight?
OK, I'll start.
No, because I know from previous calculations that up to three adults and full tanks, with two of the adults in the front if there are at least two, leaves a reasonable W margin and is within B. I wouldn't put two of the three in the back, however, or put four people in, or put anything at all in the luggage compartment, without doing a W&B.
I'll now be told both:
(a) that this is appalling airmanship, and:
(b) that nobody else does either.