I see absolutely no problem with the 7 and 14 day challenges. Sure, they may never be achievable by someone following a rigid training plan that requires 1 or more rest days per week. But how about the recreational rider that rides an hour a day just for exercise or to lose weight? Riding an hour at a moderate pace everyday isn’t going to hurt him or cause him any issues; he’s not going to worry about burnout or over training. Those achievements are within his grasp. Some of the other achievements might always remain outside his reach (like hitting 1200 watts); he needs something that he can strive for and actually attain, too.
I don’t think the challenges are necessarily bad for someone following a training plan, either. If you really want the achievements, you can just do the off day really, really easy, at say 50 watts. (set the difficulty slider to zero on a smart trainer so the hills feel flat so you can keep the watts down). Seriously doubt you’d notice any ill effect with such a low effort just long enough to do one lap. In fact, I did the 100 mile challenge several days ago. The next day I rode a couple laps at a super-easy recovery pace, less than 100 watts. The second day after I felt better than two days after other similar rides wherein I stayed off the the bike the day after.
I’m not sure I’d ever get the 14 day achievement, mainly because it would be difficult to find two weeks without some day not having the option to ride on Zwift (either because of other commitments, or because the weather was nice enough I rode outdoors).
And I cannot fathom how Zwift offering these two achievements somehow makes them “irresponsible.” If it is irresponsible to someone’s particular training plan to accomplish these achievements, it is their own irresponsibility, not Zwift’s. I’m actually surprised there isn’t a 30 day challenge. There are plenty of other challenges that Zwift offers that can be achieved by someone following a “responsible” training plan. (There is an achievement for completing a workout; maybe they should add another for completing on of the multi-week workout plans)
And while these 2 challenges can demonstrate a loyalty to Zwift ,and a recognition on Zwift’s part of someone’s commitment to the program, I think Zwift does offer plenty of incentive and encouragement to riders who are regular users of the platform, even if their training program precludes them from completing these two challenges. The rider points and levels and unlocking of kits and bikes and wheels is plenty of incentive and encouragement in my mind, not these two particular challenges. BTW, do either of these challenges unlock anything? I don’t remember the 3 day one doing so. But the metric and imperial did.
Anyway, that’s my long-winded 2 cents.