If I am using sashing I don’t worry too much up to 1/8. If the block is very basic with minimal seams to line up (such as a 12” block with seams meeting at 4” increments), I don’t mind a bit of easing.
if the block is complicated with many small pieces and multiple seams to align I try to be perfect and will keep ripping until it is. Fortunately I don’t make a lot of complicated blocks.
i do notice the words “that will do” coming out of my mouth from time to time when I am making the 22nd block out of 25. That doesn’t happen on 5 out of 25. In other words the longer I work on a project the less of a perfectionist I become. I move onto the ‘let’s just get this over with’ stage!