With film the options afterwards were limited, difficult, and expensive so the rule was "get it on the film". That was especially true with ND grads and chrome. There just was little other choice and you pretty much had to live with the decisions you made when you made the chrome.
Now we have greater DR (and it is improving all the time) and cheap and effective PP options. So I prefer to have my camera original RAW file as unaltered as possible. This allows much more flexibility afterwards. I also prefer to carry a much lighter load in the field than in the film days. I carry three glass screw-ins (3 stop ND, 8 stop ND, and CPL) in 77mm with step rings for smaller lenses. It all fits in one small pouch that hangs on my belt. Everything else is done in post. ETTR gives me lots of options.
Besides, that grad line is almost always in the wrong place or too straight for the image.