If anything this very topic and debate is a great example of what could happen, if the act is passed right now, it is clear that quite a few members of the region won't be satisfied.
Isn't this debate good? We're only just now hearing what everybody thinks even though we've been talking and working on this bill for weeks. The OA would always cause more people to give their thoughts. Currently, even though everyone can voice their concerns in the Citizens' Platform, only the UH's opinions matter as they're the ones who pass the laws. If there was an Open Assembly, all people can actually make an impact through debates and votes, and they'd also more likely say something against the popular thoughts since, again, they actually have a vote and can cause others to change their thoughts (and thus votes).
The biggest issue being voiced, however, is the "Tyranny of majority" mentality like what is being questioned here as to why people waited to voice their opinions.
When you're in a room of people that are 100% completely for something that you yourself are against, it becomes harder to speak out for fear of criticism, judgment, and ridicule. We've even had some members on here go so far as belittling others when they disagree with what that person agrees with.
Those members are very far and few between, but the criticism itself isn't. Debates get heated, and it can be hard having an opposing opinion if the person you're debating is like a brick wall.
Likewise, when it's multiple members opposing your viewpoint, it can be even rougher, and some people will feel like they shouldn't even speak at that point.
Again, taking this act for example, it received widespread support aside from maybe one or two members when it was introduced. It was talked up very highly, and people have been exceptionally excited for it. At that point, others might have been afraid to express opinions against it because of how hugely it's been supported.
But now that some have finally spoken out against it, those members are starting to step up and find their voice to speak on their feelings about it.