I can say that removing those mold seams, flash etc. is good and easy way to improve the model, you're building. Real car doesn't have mold seams or other stuff like that. It may be bit boring to smooth them out, but finished product sure is worth that. I know that I've done mistakes and I've left those mold seams etc on their place too, but on the last few years, I've been removing them as good as I can. Those seams etc give unrealistic look on builds, even if the model car would be built well, but those little things "Hit To The Eye".
Along with good paintjob, nice detailing and clean building, filling ejector pin marks, smoothing out Mold Seams and Mold Flash, is very good and easy way to get that model look better. I highly recommend to give it a try.