Anecdotally, I've noticed with friends and acquaintances that this leads to what basically comes down to a de-motivating effect, i.e. the "reward" via built-in mechanisms (like productivity, exercise, etc) gets attenuated over time as marijuana activates similar reward mechanisms very quickly and reliably via something as simple as inhaling. Basically "why bother going for a run, smoking makes me feel even better and I don't have to do anything".
I don't want to seem critical or anything of the sort, I've just seen it myself in multiple cases and it "makes sense" to me.
Your anecdote seems to counter this. Do you find the effectiveness of this strategy reduces over time?
That said it's obvious daily drinking has similar reward system impact with significantly greater overall health consequences.
An indica can put me into a lethargic state while a good sativa gives me as much energy as a cup of coffee but provides 2-4x the head rush.
I will frequently hit a sativa vape before going on a run or doing chores because it makes it a more pleasant experience with no downsides. If I were to swap to an indica it would not be enjoyable whatsoever.
Many tasks don't need 100%. I find laundry and dishes more palatable with a buzz, and I don't mind them taking a bit of extra time.
One of those things has far greater generalizability and statistical significance than the other. I'll leave it to you to guess which is which.
Looks like you've answered your own question for people in pain who have finally gotten a legal non-toxic alternative to their former overly toxic pharmaceutical consumption.
Maybe these statistics also are influenced by workers who have now dropped alcohol in favor of cannabis too, and are accomplishing more as a result?