Note that I've had friends try to split bills to the penny. I tell them to stop, because both our times are worth more than that. (The exception being if I know they need the extra cents, in which case it still seems more reasonable to round down in their favour.) That kind of gentle social shaming is productive and something I've noticed a lot of people my age shy away from.
TL; DR If you think Venmo is ruining your friendships, it probably isn't Venmo.