IMHO, if you are built so that the "standard" gun deminsions are a good fit for you and you have a good, repeatable mount, you can get along just fine w/o a fitted gun.
Unfortunately for me I am not built so that standard fatory guns fit. My shooting success has dramtically improved after getting a fitted, bespoke gun.
My last purchase, an RBL-28 with CSMC standard deminsions, prevented me from even seeing left to right birds. Too much DAC so that my right master eye couldn't see the bird.After getting the stock bent, I can see the targets fine.
Still have to HIT them, though.
