Joe Biden is going out quietly but with trademark decency | Margaret Sullivan

As with many a lame-duck president in the past, it feels as if Joe Biden has already left the national stage even though he has a month left in his term.

In his case, that disappearing act is vastly exaggerated by the man who was his predecessor and will be his successor. Donald Trump sucks up every bit of oxygen in the room with his daily outrages – horrifying cabinet choices, transactional friendships with oligarchs, appalling social media posts.

With all the lack of grace we’ve come to expect, he is threatening and bragging his way to inauguration day.

Biden, by contrast, is mostly low-key and taciturn.

One of Barack Obama’s former aides, Jon Lovett, took a sarcastic jab on the Pod Save America podcast: “Joe Biden believes in tradition and institutions, and we should only have one president at a time, and I think it’s a surprising choice to allow it to be Donald Trump.”

Some major news organizations are giving Biden an extra shove into the wings with coverage that emphasizes what we already know: that Biden, at 82, is old and less than vibrant.

A Weary Biden Heads for the Exit, read a headline in the New York Times, with observations, in the newspaper’s own voice, that Biden “looks a little older and a little slower with each passing day”, and that “it is hard to imagine that he seriously thought he could do the world’s most stressful job for another four years.”

The Wall Street Journal reprised its once disparaged and now praised coverage from last spring about the president’s increasing frailty with a story about how staff shored him up and distracted the public and the press: “Aides kept meetings short and controlled access, top advisers acted as go-betweens and public interactions became more scripted.”

But even in this diminished state, and even amid low approval ratings and endless criticism, Biden remains himself to a large extent: decent, optimistic, patriotic and empathetic.

In an extensive video interview published recently by the progressive, independent media organization MeidasTouch Network, Biden sounded cogent and thoughtful as he answered questions from founder Ben Meiselas.

Granted, the interview was non-combative; rather, it was notably tactful and respectful. But it was also substantive, and Biden sounded the familiar notes as he pledged to attend next month’s inauguration and explained why he invited Trump to the White House, despite having often depicted him as a threat to democracy.

“Because it’s who we are as a nation, it’s how we’re supposed to be … ” he said about the peaceful transfer of power. He emphasized his belief in the American people and joked about being what he called “congenitally optimistic”.

I’m not sure I share those rosy views, given the outcome of the election and the way things are unfolding day after day. But that’s vintage Biden.

And as I watched and listened to him answering Meiselas’s questions, I somehow felt nostalgic – yes, nostalgic for a presidency that hasn’t even ended, though it is fading fast.

I couldn’t help but think that – despite all Biden’s well-documented faults and misjudgments (including failing to step away much earlier from the presidential campaign) – this president has done a lot right.

His accomplishments are real, and his decency as a human being is, too.

Some of us, at least, are going to miss him when he’s gone. Even if it seems like that has already happened.

• Margaret Sullivan is a Guardian US columnist writing on media, politics and culture