In general, contracts often are a good leading indicator of how a counterparty thinks and is likely to behave. Do they start with egregious terms and conditions, do they flex on some of those are all good signals.
One example: does the counterparty start with a one-day NDA or a mutual NDA template.
I presume you meant one way NDA, your overall point is a really good one. Contracts are very useful as a leading indicator of how the counterparty thinks about the relationship.
I've never seen or even heard of one way NDAs.
If you go interview at a Facebook office, you'll be asked to sign one before they let you in. Basically - "we'll tell you stuff. That's confidential. You tell us stuff. That's not confidential".