Many people would say falling pound is not a benefit
e.g. holidays abroad more expensive if pound in your pocket only == 1 Euro.
e.g. Imports cost more, inflation up, shopping costs up: Average "person on the street" sees falling pound effects as detrimental
It's a benefit to those who export goods / services as they become cheaper compared to other countries.
Its a benefit to an employer to have everyone paid as little as possible, it's not very beneficial for the employees.
.. so, "benefit", depends on your viewpoint, majority viewpoint says falling pound is not good.
Caveat "majority" does not always mean best viewpoint, see Brexit