Uppa bassinet vs Car seat for newborn walks

Is it safe/ comfortable/ okay to take a newborn (due in May, so this will probably be June-August) for walks in the vista stroller while still in the car seat that attaches to the stroller, or is that something you really need the bassinet attachment for?

Please no judgement for getting UppaBaby, it’s being gifted from a bougie relative who swears by it and I’m just grateful to be getting a stroller car seat travel system. Just wondering if I should purchase or find used the bassinet. Thanks.