I know very few followers who have continuously, daily training as the strategy to become better dancer. Most followers take courses every now and then and consider the dances with more advanced leaders as their main strategy.
Think of a tennis court where a world champion is playing with a beginner. Yes, his skill makes it possible to return all the balls and if he is a nice person, he can drop some of them to create a friendly atmosphere. His skill makes it also possible to place the balls so they are easy for the beginner to return.
The situation is totally different for these two. The beginner is amazed that she is able to play with the world champion and she thinks she is really good, playing with all her capacity. For the champion this is not so much about skill training, playing at the edge of his ability, but about caring, to be nice.
The biggest issue here for me is the situation when she returns to the same tennis court, but this time with another beginner. The match is totally different and it is easy to explain the difference by pointing this new playmate to 10 levels lower stage ( incorrectly). This kind of false idea of your own level creates difficulties in learning and you maybe get to the partnering stage later.
Partnering stage is (for me) when both are playing/dancing at the edge of their skill without compensation from the other, mutually exploring new things.
*This posting is a responce to a specific situation for followers but some parts could be valid for leaders too.