Possible but I do wonder if this isn’t a fallback.

E.g. use resource values but in the edge case where there’s no logistics in/out then we need to allow you the basic ability to fix that. Build roads/bridges/ports to rectify it. Ideally you’d do this so the city can operate at a barebones level to make that happen.

If so seems like the kind of thing you put on a degrading curve. So at first it covers hiccups (cut off all input/output lines such as bridges temporarily unavailable) and helps with computation instead of having to “real-time” calculate every item in/out. It’s easier to just let you aggregate in time intervals throughout the day.

Then if that state continues you start impacting the “production” of those businesses internal warehouses down to 0 until the city is basically dead and it’s “game over”

If they did something like this the bug could be improperly applying that curve and so it isn’t scaling down.