I was going to say something about this problem, but soon I found a post in some forums about it. The guy who made that post remain in that forum on in Feb of 2007, and dispeared totally after that.
It was clearly stated that "we would concentrated in the quality of the drinks, but not the paintings", or similar. It was not due to the creater of the forums, but the participants to get "those" people having different opinions out of that forum, and shut up to talk about their own opinion about coffee and this duty, or passion or work.
I had recognized that I am not alone, but those had been kicked out of the sights and hearing.
In Chinese language, we used to say that "to better show on the perfect bases", that means that one can make a some very good things in a better look or something. If the shots are perfect, one can make it in a better look. But, the fact is normally not this as we all know around the world. We are still in a very low developing level of understanding espresso and its brewing skills, as well as its quality standards. Not even a single language to talk about different coffee drinks.
But, never try to define the tastes, it simply not possible.
I do not do the latte art almost, but train people how to prepare for it and how to practise for it, if necessary and they would. I spent a lot of time to practise of brewing espresso and find problems and solve the problems. I would not practise for latte art, and I do believe it takes a lot of time from practising brewing espresso.
I do not do latte art, not even brewing espresso for myself to enjoy. Although I know how to do it, I do not fix a set of machines, grinders, blends and working status for the machines, so that I am not experienced to make it perfect very soon. From our trainees, I can get a better one to enjoy.
Suppose I spent a lot of time to practise the latte art, I am sure I won't have enough time to think about espresso and its brewing.
For example, I used as firstly a computer in 1986 and bought my first notebook computer in 1992, and set up a forum about using of application softwares in 1997-98, which is still there and very active without my attention from many years ago, but I never be enrolled into software programming, neither coding.
Many people can learn to make latte art perfectly, but not many people can really understand espresso, and set up a new and well organized theory about coffee. So, that is what I like to do.
Recently, I had new trainee, who had see a lot of message about those rules and undestanding of brewing espresso from websites, forums, and books (all books in Chinese he can find), and so on. After my course of our coffee theory, he understood why we are right and why others' are wrong. How can I convince him? I am not a magic teller, but only tell the trueth, and the reason, and practise until to make a shot.
Tamping force? Theoretically, he understood, and practically he experienced it. So, for him, there is no way to refuse to believe us. We did not hide your opinions aside, but telling them all directly. They can even try different ways until they find the trueth.
The "Golden Rules" are printed on a large board and attached on the wall in our practicing room. For each item, we have our own explanation and our trainees can see it every time when they are practising.
What do we really expect?