Digging the hole isn't the hard part, but who wants to trench 75' when every inch off it is frozen for those 2-5 inches?Get a shovel and see if you can dig in the ground.
The cable only needs to go a few inches down below the grass. The pole on the other hand needs to go a few feet down. They say 42 inches, but anything close usually works.
If you can dig, then likely your tech is lazy and just wanted to get out of doing the pole mount.
The ground is generally frozen the first few inches anyways. Like the other poster said a bucket of hot water does the trick. Even if you do a roof mount, hot water can melt the ice.
As far as calling mis dig, yes that is the proper procedure but really un necessary. Unless your doing any work on a property line or easement for the power lines, chances your ok to install.
I really don’t get what the big deal is with pole mounts. I’ll take a pole mount over going on a high roof any day
I wouldn't use hoot water. It's messy. Just take your drill and drill a half dozen holes in the ground. It breaks it right up