Does anyone else feel like their analytics show traffic but never tell them what makes money?

Honest question for the builders here. Every analytics tool i have used is great at telling me people showed up. Almost none of them tell me which of those people, or which source, actually turned into revenue.

A conversion event is not the same as money. Someone can fire your signup goal and never pay. Someone can pay without ever hitting the event you configured. So the dashboard says one thing and the bank says another.

How are you all closing this gap? Are you tying revenue to source inside your analytics, in a warehouse, in your billing tool, or just accepting that you do not really know? I am trying to figure out if this is a universal problem or just me being bad at setup.