Maybe they are? The question is, what am I doing differently in this universe compared to the universe where the canary is still present? It seems like your answer is "In this universe (canary removed) I no longer treat reddit as a secure and private communication platform." My personal threat model assumes that reddit is not a secure and private communication platform so the status of the canary does not change my behavior, utility schedules, outlook, etc.
I personally would not be doing anything differently but that is besides the point... they should not be able to get that data without a warrant. So I guess the value of it would be that you are now aware of something else that the government is doing that they should not be doing...
I apologize if I am missing something in your answer but "NSLs are bad, mmkay?" does not seem to be very responsive. We knew about NSLs before warrant canaries. If that is the only utility they provide it seems like they are not very useful to me.