Very polished kickstarter but I'm left wondering, do I really need an $80-$200 charger? The MacBook air charger is already pretty small and my phone lasts all

Very polished kickstarter but I'm left wondering, do I really need an $80-$200 charger? The MacBook air charger is already pretty small and my phone lasts all day without the need to recharge. Although the tech inside it might be novel and interesting I really don't see the cost vs benefit as a consumer.