divernva once bubbled...
... such as losing the ascent line or boat in poor visibility. Or getting blown off the wreck. But definitely try to account for as many issues as possible in your planning. Using the marker as a crutch for all dives is probably not a good thing... sort of like the "Boy who cried wolf".
There may be boats that want you to use a marker for ascent as protocol. Haven't encountered any in my brief experience with the dives off the East Coast. But depending on the conditions that day, it may be acceptable or required.
I'd also have to stress that the crew knows and agrees to your usage of the signal device.
Ken