How was the 1965 WAN connection between two computers different than the packet-switched ARPANET?
// Recent Questions - Network Engineering Stack Exchange
In the essay "Brief History of the Internet," this event is noted:
[...] in 1965 working with Thomas Merrill, Roberts connected the TX-2 computer in Mass. to the Q-32 in California with a low speed dial-up telephone line creating the first (however small) wide-area computer network ever built.
So, a computer was connected to another remote computer via phone lines.
How was this functionally different than the ARPANET which would come four years later (in 1969)? I realize that packet-switching was a key feature of the ARPANET, but functionally it simply achieved the same thing as this experiment: a computer connecting to another computer remotely.
For a non-networking professional, what are the major points of differentiation between these two situations? How was the ARPANET superior to this situation?
(Note: I realize that it must have been, I just don't know why...)
Shared via my feedly reader