I do remember the impression however, that the protocols did not scale
well beyond a small LAN.
Apple deserves a lot of credit for trying to smooth over the UX. The reality wasn't that things were very much plug and pray. I absolutely remember things grinding to a halt for instance when trying to print with more than 1 or 2 computers on the network. Unfortunately networked PCs started to become fairly popular around the time that Apple went to shit. Pretty much everything > 7.5 and < 10.4 was a hot mess with the worst being MacOS 8.x and 9.x with their instability and disk corruption issues.Trying to integrate Apple stuff into a heterogeneous network? Ughghhghgghgh. Neither AppleTalk nor MacTCP were PPC native, so with PPCs we got OpenTransport. Compared to e.g. Trumpet on Windows, I always seemed to have problems.