The primary factor is proportions.
If a building becomes architecture, then it is art.
People buy a chair, and they don't really care who designed it.
I have no philosophy, my favourite thing is sitting in the studio.
That is the artistic task: To choose the best from these solutions.
There is always a point when one senses one's lack of skill, the doubt.
Architecture tends to consume everything else, it has become one's entire life.
Almost every time I make a building, some people will condemn it straight to Hell.
I don't see that any buildings should be excluded from the term architecture, as long as they are done properly.
Now, the downside to conservation is that so much is done for the public, which almost always mars the environment that one wanted to conserve.