1970 Datsun 240Z — are cars becoming too dependent on one screen or module?

I'd wait for the actual TSB/recall population, not the headline. Check whether your 1970 Datsun 240Z VIN is actually in the affected batch before you plan a dealer day. That's where I'd start. On “are cars becoming too dependent on one,” that was the fork that mattered for me. Have you gotten a second quote in writing? Wrote this up on my lunch break.