Display and routing are to things. The fact that it is not used in routing is one thing. If you have to drive 20 km and 500 meters of it is 30 km/h instead of 50 km/h in urban circumstances, it will not have a big influence on your travelling time.
Based on the beginning of your sentence I guess the answer is no, but the question was: Is it displayed in the map? Are conditional max. speeds displayed in the map (as a max. speed)? I think it is more important that it is displayed at all times (for safety) also in the "off" hours, then that it is not displayed at all.
And as a second question (also based on your reaction): Are max. speeds only displayed during routing? Not at "normal" map view?
Harry