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I'm taking the exact opposite view here, respectfully. Sure.. if nothing happens to the President then the VP is of little consequence. But let's be frank - both of these candidates, Biden and Trump, are in their 70's, 77 and 74 respectively. So they are one health issue away from their VP assuming office.
We also live in very divided times, and darkly speaking, assassination attempts aren't exactly missing from the US historical record.
And finally, the VP does do a few more things. They reflect the kind of cabinet a would-be president wants to create, the kind of political team and company they are willing to associate with and foster. If they pick a VP that holds extreme views, that makes me want to vote for the main candidate less. But if they pick someone that can help possibly reign in a candidate's more extreme views, it can show they are willing to surround themselves with more 'centrist' ideas.
I think having a VP debate is definitely worthwhile, but you only need one. So I think the current format makes a lot of sense. I would not be for a second or third VP debate, as that would be too much. But one gives you an idea of what kind of person the presidential candidate sees as a worthy partner. And VPs can really find themselves influential on some policy issues throughout a 4-year term as well. They have the ear of the president and a seat at the table. Should know how that person thinks and where they stand on XYZ topics of the day.