I completely agree that making insiders' trade public and real time (so it's legal to trade with insider info) makes a lot of sense. Information asymmetry is the problem with insider trading, which is solvable by making this info public via the trade action, and not the idea that some people are advantaged via insider info (i don't care if such and such senator or exec gets a good trade using insider info - i care that the info is late to the market and the public can't know it in time).

However, there's still one aspect which cannot be captured by such a transparent info source - the change of heart; i.e., if an insider were going to sell, but hears private insider news that makes it good to "keep" the stock, this info doesn't flow out. Inaction is also an important piece of insider info which insiders "act" on.

I suppose if the good news makes the previously intended sale not happen, it _should_ theoretically also make the insider want to buy more (subject to cash i guess). So hopefully, such insider "inaction" doesn't happen very often.