For an individual user not doing audio/video work in the cloud 2TB is a lot, but on a family plan that 2 TB is shared across all users so it with five heavy users that could get chewed through pretty quickly.That's insane. I never knew people would need more than 6TB, let alone 2TB.
That's one thing I like about Microsoft's family plan - each member gets their own 1TB of OneDrive storage space.