In the early stage true momentum can be hard to observe.

For example, imagine looking at the stars on Github as a signal of momentum.

If there is a discontinuity, for example being on the homepage of HackerNews, that will lead to net new stars.

But only the stars produced by PMF really matter.

Those little blips of discontinuities obscure the underlying curve.

Some microbursts then lead to later aftershocks of other places covering it too, leading to net-new inbound.

But overtime all that matters is true PMF.