I'm never going to tell anybody what to do with their rig/sound, but suffice it to say even if you're not hearing it, acoustic coupling is still happening with a bass cab on the floor.
If you don't care, that's cool. If you like the perceived bass boost, that's cool, too.
I've probably told this story here before, but I used to have a franken-rig with 2x15 + 2x12 and a ton of power. I used a 1/3 octave eq on it, and dialed in what I thought was a great scooped tone in our practice studio. On the first gig with my new eq, our sound guy came up after sound check and told me I needed to dial back my 50 Hz boost because it was (he claimed) the resonant frequency of the stage. Sounded/felt great to me, but it made the FOH muddy and uncontrollable.
Given all the inherent phase issues with omnidirectional, long-wave low frequencies bouncing around a room, IMO it's good practice to maintain as much control as possible. Depending on the stage, foiling acoustic coupling is an important part of that.