Deep333- I’ve used subs on and off for 30 years. Used rel subs on and off for over 20+ years. The most benefit I got is in a small room (12 x 11) and in very large rooms (27 x 16’).
And of course HT in a theater room. The best systems I’ve had didn’t use subs and the best audio setups that I have heard didn’t use subs either.
I agree that you can use subs to treat certain areas but I’d rather use a speaker that fits the room that gives me the bass quality hat I’m after without subs. I have subs just sitting there not doing anything and I’m fine with that