There's a lot of catch 22's going on here...
Not trying to talk anyone into liking extended talking heads scenes but you can't just remove them or alter them to the point of hurting the overall story. Reductionism tells us we learn more about characters when we let them talk instead of just act.
If you remove the drinking below deck scene in JAWS, because it slows down the movie, Quint never gets to talk/act his way from paid mercenary to character with a tragic backstory explaining his Ahab-atic motivations.
If you don't take the time/space to build the characters, there's going to be just as many readers talking about how flat and two dimensional they are. Nothing they do or that happens to them has meaning because of a lack of connection to them.
So...you go to the argument to vary it up more visually, that it's too many facial shots....
If you throw too many bells and whistles on top of it, you're distracting from how the characters are acting/reacting to the dialogue. I go back to the JAWS scene, they isolated the three character in darkness and ocean... a nondescript under deck and just focused on the actors/dialogue. Quint's Indianapolis speech alone is like 4 minutes of close up. But it's gotta be there... if you cut away to shots of fishing reels and anchor chains, you lose the character development of it.
And sure, I'm talking about an auteur in a different medium ... but the basic point remains. In Western Comics... the top authors are frequently engaging in almost entire issues of talking heads to set up later arcs. Brian Michael Bendis, Tom King, Alan Moore, Ed Brubacker and so on. Neil Gaiman's Sandman is what...75% or more just dialogue scenes between characters.
If the point is the majority of creators aren't executing them effectively... then I can only add the people I'm reading are doing it just fine, in my opinion. One of my current favorite strip is KILLING it... minimal backgrounds, just characters wonderfully acting out charming dialogue.