...And I've recently returned to more steady-state cardio, after more than A DECADE away, doing strength and interval training/HIIT. I *like* interval training, and I think it's excellent for building cardiovascular endurance quickly... but I think we'll see the pendulum swing back. Everybody's different and we respond better to different amounts of different training.
My rotations always include a lot of cardio in addition to whatever else I do... but that's because I really like it. I like strength training (weights), too... but I tend to get bored unless there are cardio intervals or it's done at an aerobic pace. FWIW, my "best" results have come from the following workouts: Long steady-state cardio on machines (in my 20s); HIIT alternating with cardio/strength intervals (in my mid 30s); and BBL + barre (late 30s). Those are three pretty different training modalities, and they were all equally effective in terms of weight control. Not coincidentally, they were also my longest and most focused rotations... AND my most focused eating plans.
I am trying to give up the "what's best" mindgame. *FOR ME* (YMMV), I have never seen magical results from any kind of training... but I see CONSISTENT results from EVERY kind of training. If I pick something and do it with focus and intention (ie, a rotation), instead of just winging it (doing whatever random workout strikes my fancy on any given day... or not), then I tighten up, slim down, and get stronger and fitter. I will always, always be short and curvy--I'll never be solid and cut, or long and lean and graceful. And I'm gradually becoming OK with that.