If you had fader trim available, you would understand what Mixerguy is talking about. I mix through a Yamaha 02R96 and use fader trim mode all the time. It is quick and the most musical way (imo) to trim automation. We have reached an age when making mix moves while not LISTENING to the audio is normal (of line editing). Mixerguy is old school

and wants to actually listen while trimming.
If I was mixing in logic, I would love this feature. Of course, there are a few ways around it so it's all good.