In his speech ‘On the extensive introduction of industrial methods, improving the quality and reducing the cost of construction’ (1954) Nikita Khrushchev says: "We are not against beauty, but we are against superfluity. The facades of buildings should be of beautiful and attractive appearance, and this should be achieved as a result of the entire edifice having good proportions, well-proportioned window and door apertures, well-positioned balconies, correct use of the texture and colour of facing materials, and a proper presentation of wall parts and structures in buildings made from large sections and panels. [...]"
While it is hard to define the word simple, assessing beauty in architecture is quite impossible.
Khrushchev, Nikita, ‘On the extensive introduction of industrial methods, improving the quality and reducing the cost of construction’, 1954