Now one could probably make an argument that any sort of movement could be a technique, however that doesn't mean that it isn't also part of some style (which is what I thought you were trying to say). For me (i.e. my opinion), I worry about technique to help me do something (possibly a style, connection, stability, or whatever) better, or more consistently. IMO, things like foot landing toe first, ball of foot first, or heel first, are style preferences. Again for me, rise and fall could be the end game (a style), or it could also be done as a technique to accomplish something else (like clarity of the lead for some follower). It's been my experience in tango that there are a lot of opinions masquerading as facts. I'll admit that my opinions are just that. Others sometimes do not.