I have viewed some of Luca's videos and others that explain technique. I find them very valueable.
My problem is trying to focus on to many technical items at the same time. We spent the majority of our lesson time on technique, but once the teacher recommended 2 technical changes in a particular dance, we would not let them recommend anymore at that time, because thinking about more than 2 was just to much for us.
In each dance they would review our dancing and recommend 1 or 2 technical improvements to work on and focus on when we danced. We would repeat this cycle over and over, hopefully improving all our dances over time.
We do the same thing with technique videos, we pick out 1 or 2 items to work on for awhile, rather than trying to immediately apply everything that they bring up.
I think technique is the foundation of dancing well, I just only can deal with so much at one time. I rather make 2 technical improvements in a dance over a month or two, rather than get frustrated trying to change to much.
I think it looks terrible when people do advanced Waltz/Foxtrot etc manuevers with terrible technique. I think doing basic moves with good technique looks much better, than fancy moves without good techique.