Fair, and people in swing states get inundated with ads as it is. Mostly I'd say it's more useful for mobilization than persuasion, like if you get a text reminding you when voting day is maybe someone makes it when they wouldn't have otherwise.

Ideally, volunteers could mean quality over quantity, less automated spam asking for money and instead actual humans responding to concerns and answering questions. Even more ideally, that could be paired with voters' concerns being elevated and the party actually responding to them. The goal is to improve the quality of the campaign's voter outreach, in whatever form that outreach takes.

I'm not a fan of Biden myself but I still think it's worth discussing general electoral strategies.