a humble suggestion
All paragraphs should be separated by indents. However, good page design allows the first paragraph after a header to be unindented, but as in this example, you need not leave any paragraph without its notch.
See how nicely indents provide a smooth change without separating the flow of ideas. Blocked paragraphs with no intents appear as fragmented ideas or a set of instructions, and while fine for "how-to" pages, they are not the best design format for the development of concepts.