Agreed.
BTW: Do we really need Nanotubes? Doesn't sound for me as a real resource that needs to be produced in huge amounts - like Cement or Fertilizer - rather something that any lab can produce with the right equipment.
We do need it. Nanotechnology as a tech is only kept at the two-trick viability threshold by the Nano Research Department and the Tunnel. Without the Nano Research, we would have to cut Nanotechnology and add another Modern Era tech to keep the Modern Era at 40.
Nanotubes serve a use in replacing Aluminum (the go-to for high-tech metals) in certain mecha units, double the production speed of Space Elevator, and are required for Starport, Aerospace Complex, and Durasteel Plant. I think it's established enough to keep.