Do I really need a 'high mileage' oil after 75,000 miles?

Opinions split. Many mechanics on r/Cartalk and r/MechanicAdvice argue high-mileage oil is largely marketing for engines that aren't leaking or burning oil. But the same threads acknowledge that the extra seal conditioners genuinely help engines that are weeping or consuming oil, and bobistheoilguy.com posters specifically call out Valvoline MaxLife as carrying more seal conditioner and additive than competitors.