Regarding my example of >30 tabs:
We use tabs to group related flows per module of the manufacturing line. Depending on the project's size, it is further split up into one or multiple tabs per request type (checkin, checkout).
The flows, however, are rather independent, no link nodes required, at least between the module tabs. They just register an input node with our PLC broker, perform custom data handling and send the reply.
Until now, navigating and visualizing link node wires has not been an issue and works well with the current implementation.
I could imagine your proposal might be useful for larger interconnected tabs. But it should be easy to be enabled/disabled, maybe by keyboard shortcut or the new command box in v1.0.