Interesting thoughts, as always. I don't know if Biden is really a labour guy, though. He may have a blue-collar background, but he's known above all as an "institutionalist" and as your average centrist, corporate Democrat. True, to the displeasure of other countries, including Canada, Biden has followed Trump's America First policies, so he's trying to strengthen American manufacturing by subsidizing certain industries. But in the long run that's not going to help American workers (by shutting out foreign companies that have competitive advantages), because it's going to increase prices in the US.
I suspect that the elderly Biden is more like Trump than Democrats would want to recognize: specifically, both politicians are transactional rather than ideological. Neither cares about principles. As you say, Biden wants to pass legislation, and he's done more in that regard than might have been expected. But he's still a placeholder in that he's not tackling the big problems.
You say there are no big problems left, but that's quite mistaken, in my view. How about electoral reform? How about reigning in the Supreme Court? How about reckoning with the fact that one of the two political parties has lost all legitimacy and is literally a cult led by a raving narcissist? How about global warming or the rise of China? How about the global authoritarian backlash against neoliberalism and democracy? How about the big tech monopolies which are wreaking havoc with addictive social media?
These are enormous problems, and addressing them would require not necessarily someone with a personal vision (since as you say, politicians can delegate), but at least someone who can sell a vision of how the country should deal with them. Biden can't sell anything because he can barely speak. Meanwhile, Trump the monstrous bullshitter is better at selling than all the Democrats put together.