I've been on discussion boards and forums about tango. In the past few months, I've read thread upon thread about technique, terminology, semantics, definitions, the should/should not be's in tango, cultural discussions, sex appeal, CE/OE, blah, blah, blah...
One thing I noticed is that most of those threads are written in the context of one's self and very little consideration given to "her"—The follow.
My take on the whole thing is this: As a lead, everything one learns, does, and executes should be done with respect to, and in consideration for the follow. Why? Without a follow, we are just fools dancing on our own.
If the tango becomes a good tango experience for her, then it inspires the lead to improve. The growth and transitions become easier and more natural.
However, if the lead just dances for himself, then he tries to keep learning without progressing positively. The journey becomes arduous and frustrating.
We try to lead well. Because, in the end... It's all about her.