I think it's hard on Strictly- like rumba for example the hip action is a big part of it but isn't a natural feeling, so I can see how it's easier to get them to 'wiggle' a bit and hope for the best, rather than focus on the mechanics of it in just one week.
Some things like the heel leads are really worth doing; (a) because it's correct and (b) because they're easy to see and it's generally easier to get somebody to remember to do a heel lead than to dance in time if they really struggle to find a beat.
I also think if they're struggling to learn a dance they should do a bit more practising rather than going roller blading/to a football pitch/to a boardroom. I don't mind something a bit different happening, like if they go to a social dance club or have friends and family come to training (I'm pretty sure Gethin went zorbing before his VW), but the sake of doing something different for the sake of it every single week irritates me.
Series Seven was when it became gimmicky really, new pros, new dances and the start of the costumes and props. And mark inflation...