Interesting, because this is main reason I don't like Venmo, and prefer PayPal, but everyone seems to want to use Venmo. In my social circle, many people have expressed similar sentiments.
I think the main thing they hit is being able to pay your Facebook friends by entering their name, before Facebook had Facebook Pay. Come to think of it, it would have been much wiser if Facebook acquired them instead of rolling out a competing payments system.