What is the benefit of architecture that is designed with decoration?
What is the benefit of architecture that emphasizes function and discourages decoration?
Think about the structures you frequent and comment on architectural decoration vs. function.

The reason for architecture that is design with decoration is that it is offer entertainment to individuals. It might be a structure worked for divine beings or sovereignty at some time in the past, thus it should dispose of tension and stress which could be another explanation behind adornment.  

While the advantage of engineering that focus on something, the study hall or school can be good example.  

It isn't gorgeous and alluring , thus it make to hold student and educators in an equivalent space while they learning and instructing individually. For the most part, we use habitually the structure, for example, school, store, libraries as opposed to lodging. Watcher of such structure or plans of building just need from those structure is that to decide something effectively what they need, so it doesn't need to be outwardly engaging in light of the fact that they fill increasingly significant need.

Form follows function

Explanation:

The main role of most of modern architecture is functional: it believes that it must define structure and not aesthetics. Therefore, the form follows the function and this goes for much of the modern architecture from 1945 to 2000. The Dutch School (Berlage,  Wiebenga) is a good example of functional architecture, where the building must fit it´s purpose, i.e for the benefit of the person living or working inside.

In contrast stands the architecture of the Romantic 19th century, where decoration and aesthetics were overwhelmingly present in the organic constructions of, for example, Gaudí in Spain and Hundertwasser in Viena. These buildings benefited the persons (the people living in the city) outside the building. for it´s sheer aesthetical value. Important too, because, what is life without Art?

what is the other part to the question