[bobbylarrybobby]

Pinyin should be approximately as ambiguous as the spoken language, i.e. not very (especially if whitespace is used to denote word boundaries)

[Chathamization]

Removing the added information would make it much more difficult to parse, though. Paragraphs don't exist in oral English - or spaces between words, quotation marks, capitalization, etc. - but we still find it much more easy to read properly formatted text than improperly formatted text.

Just because people are able to understand strict phonetic transcriptions, doesn't mean it's a good way to convey information (which is why almost no language relies on just strict phonetic transcriptions).