Using a tech camera without any tilt or shift and retro focus lenses reduces apparent lens cast, even with my Rodenstock 40 it isn't too severe. (IQ180 back which I believe exhibits the most problems). If you shoot a lens cast calibration shot with almost any lens you can see some LC and light falloff, even for reflex design cameras. I have found that often with my rodenstock 40, 70, and 150 there is no obvious issue on the image, although with the 40 there is enough going on it's better to correct it (I also usually correct on the 70 as well). The 150 I don't worry much about it since the problem really isn't color cast but just some light falloff (lunless I've shifted it).
You shoot the calibration shot each time you change anything (focus, shift/tilt, f/stop). However, as an example the difference between one taken at f/11 and f/16 is pretty much imperceptible. I have a full set of pre shot calibrations that I can use when I forget, and even though they aren't perfect (focus may have been different, they are all shot at 11 and maybe the shot I'm correcting is not), they work fine. I'm really bad about remembering to shoot one, but I manage pretty well, never really lost a shot because of it.
LR does not perform LCC corrections but handles vignetting pretty good for the 150 and even the 70.