What information asymmetry? Liquidation preferences are perfectly fair, and not at all a mystery. Especially in the year 2019 when there has been an enormous amount written about them on the internet.
When I was awarded options I was not given any paperwork other than the grant and basic info about it. How is anyone to know what documents have been written without a database of the relevant documents?
It’s bullshit to keep relevant paperwork a secret.
The parasites writing these contracts are counting on people not taking the time to become experts in shady startup contracts. As evidenced by this article, it's working.
It depends on whether your role in the company means that you are part of negotiating the deal. If you are the CEO: then probably yes. If you're an IC engineer: then probably not.
Relatedly, most of these deal terms are pretty standardized. In the vast majority of cases there aren't a lot of negotiations around liquidation preferences, only negotiations around valuations. The exceptions to the rule tend to happen for very large or late stage fundraises.