As someone who's been making espresso for 2 or 3 years, atm, I weigh my coffee in, but not out, because my espresso cups are so small that I "know" how much is coming out. Aka I used to weigh the output, and not anymore, to make my life easier. If you use enough of the same coffee, if you find the right scoop, you could also do without weighing the coffee because you'd know closely enough how much you're putting in. Repeated enough, the human eye is very good at estimating these things.