If I’m making something that will be thickened there is no need to run the result through a fine meshed sieve. And most of the time when I cook that is the case. Which means no unnecessary waste.
If you want a broth then I suppose I could let it sit until the solids have settled and scoop off the liquid. What I usually do is go easy on the Bamix so the more of the solids are taken out by the sieve.
What would be more interesting would be to do both: juice first, the sautee and then cook the pulp and finally combine the two.