The major thing to remember about the ToJ is that it is taking the current day into account.
If you regularly do runs, say, Monday, Wednesday and Friday then a couple of weeks in it'll say nice(r) things on Saturday, Sunday, Tuesday, Thursday.
But looking at it on a Monday morning it'll see that in the last 7 days (including that day) your running load is down because it doesn't go back to the previous Monday where you did a run. It only really makes sense if you've done your run for the day if you had one scheduled.
Even then it may be unkind but I only see that if my training in the last couple of weeks has been less intensive than it has been in the past.
It's also better if there's a bit of structure and variation to your training. Mine used to say "Detraining" or "Unproductive" quite a bit when I just used to go running. Now I've got a progressive structure (a 4-week cycle of easy, medium, hard, recovery weeks) I now get it saying "Recovery" instead of "Detraining" or "Unproductive". It's expecting a balance of "low aerobic", "high aerobic" and "anaerobic" load rather than just smashing out one "high aerobic" run after another (which is what I used to do).