It's a stupid reprint that has John wonder if open and honest communication is somehow a bad thing.
Panel 1: John tells Elly "You know what's good about us? We talk to each other." Insert mocking comment about John's eyes being brown because he's full of shit here.
Panel 2: He continues spreading manure not supported by the evidence by saying that they're open and honest and let their true feelings out.
Panel 3: It's Elly's turn to remind us that she can lie with the best of them by saying that she can't remember the last time they had a real fight.
Panel 4: John turns that into a bad thing by wondering if they lead a dull life.
Summary: First off, they don't really talk to each other as such because they aren't open, honest nor inclined to let anything like their true feelings out; second, there's more than one way to lead a dull life. There's living with the same humdrum arguments, boring misunderstandings and tedious free-floating hostility for thirty years, for instance.