Should you trust in-platform attribution models?

Attribution is tricky. Last-click attribution is also, uh, sketchy. Why?

1. It often confuses correlation with causation. Did views CAUSE sales or just correlate with them?
2. It rarely accounts for 10 or 12 other factors that are likely involved.
3. It’s got conflict-of-interest built in: of COURSE a platform wants to claim brand lift or sales impact or whatnot.