The workaround is to use a router between your Internet connection and your MacTCP using Macintosh, and to assign a static IP address to your MacTCP running Mac. Not a major obstacle, as any Macintosh that cannot run Open Transport is not well suited for Internet use anyway. And, odds are that you'd be using a more recent machine for web surfing, thus assuring that you probably have a router anyway.

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Another big advantage of Open Transport is being able to access file servers running OS X 10.4 (using OS 7.6 and AppleShare 3.8.3). My primary Mac is a G4 running 10.4.10 (as noted, 68Ks can only do certain things in today's world) and not being able to properly share files between the two machines was a huge inconvenience before I found out about AppleShare 3.8.3. Open Transport simply makes it much easier to deal with modern networks and the Internet on a 68K Mac. Not to disparage those that can't or don't run it, but saying Open Transport has no advantages for 68Ks is overlooking a lot.