I do a lot of trimming, my seams tend to be a bit scant plus many things like triangles I deliberately piece big and trim down for accuracy.
But yeah, my friends tease me about the amount of pinning, pressing, and trimming I do. Every step. Every time. Every piece. LOL but I feel the results show.
Even though I've trimmed the subunits, I still have trims to do on the full blocks or at least I check to see if what I have is within my tolerance level. And once the blocks are done, there is truing up the corner, especially after the border.