Most Jewish texts have a easy way to pin down a citation.
Some are numbered. For example, Rambam and Y'rushalmi and Tosefta have chapter and halacha. Some of these have different numberings in differing editions, but there aren't too many different numberings and, as, long as you assume your readers have an edition numbered like yours is, you can cite unambiguously.
Others have named (or colloquially named) sections, which are short enough that one can find stuff within each section. For example, Tanach has short sections, and many older texts (before chapters were in common use) refer to verses as being in "the section on sota", "written near Shimshon", or the like.
But the Talmud Bavli has no classically named or numbered sections below the level of chapter — its current near-universal pagination is a late invention — and its chapters (named and numbered) tend to be quite long. With some exceptions, pre-pagination texts tend to refer to citations only as "in (the start/end of) chapter such-and-such".
Why? It seems an easy matter to break up the text into sections numbered sequentially by the snippets of Mishna, as the Y'rushalmi does. Why was this not done?