Making repairs, going back to tend to the dropped stitches/opportunities, is ALWAYS worthwhile, although it is harder the further back in the work they are. The sooner you spot the dropped stitches, the more accurately you name them, the earlier both you and your partner pick up the stitch, the sooner your relationship will be back knitting up a storm.
It is truly disappointing when I have to spend a lot of time going back over my work to find the problem and correct it. But pretending nothing is wrong will not make the dropped stitch go away. Denial never works. Sooner or later the flaw in your relationship will show up. Not only that, it will get bigger over time if it is not corrected.