For the non mil or non tactical operator……
1) If you are night hunting and want to be a good neighbor yes.
2) If you are driving around shooting out of the buggy or truck….especially with a .308 or higher caliber yes.
3) If you are shooting a bit of anything above a .17 caliber at a public range that is enclosed yes.
4) If you are shooting anything .22 caliber in the subdivision and want to keep the HOA off your arse yes.
5 If you are shooting any of the above thinking that the decibels created by anything over .22 suppressed standard velocity is not causing ear damage and therefore you do not need ear protection….then no.
FWIW #1 and #2 are my primary reasons. Although my range mates likey #3