"Terence. The question was, was it good , or was it not. Was it perfection . A pupil will become a better dancer if they follow Luca's dancing and don't to any more than they did. I would hope that as a teacher you would follow the example given and keep to the one discipline for as long as it takes."
We shouldn't move on to more complicated material too soon, but if we all stayed with basics until we'd mastered them, then nobody would ever dance anything else.
The reason top dancers still work on basics is that they themselves still haven't mastered them.
After a bit of experience, dancers learn to work on multiple things concurrently; we can have material that is challenging due to its complexity, yet also continue to find lifelong challenge in the transparency of the most basic figures.
Ultimately, nobody will fully appreciate how 'advanced' the challenges of the basic material during their first exposure to it. Nor during their second, or tenth. It's only by repeatedly coming back to them over the years that we start to finally grasp how much there is to them. But we couldn't come back to them with that fresh perspective if we hadn't also been working on more 'advanced' figures in the meantime.