A note should present a complete idea. This does not mean that we should drop everything into a single page in order to understand a topic fully. The note should have enough sentences or paragraphs to present an idea and the idea only.
Sure that there will be a lot of contexts lost while creating a note, but with the help of #Zettelkasten it should be easy to create those contexts into notes where the original note could make links to them. In this way, we do not lost the contexts at all. We just hide the contexts for brevity which we could do our revision more quickly. This is sometimes called Progressive Summarization.