I believe alot hold back, just imo.
For obvious reasons that need not be said...
How many people who solicit help on (any) forum are getting responses that are 100% objective and are truly in their best interest? Not many in my view, they are always colored in some way.
Instead they are told what to buy based on what's popular on the forum, what they own or use, who they want you to support and gets the sale, etc.
In almost any forum people are funneled into a narrow range of choices that are "approved" by the community, even if those choices might not be the best solution for the person soliciting advice.
So, buyer beware.
Also lets not forget it's not always the builders that cause people to hold their opinions back, but the rabid fanboi's that can ruin open exchange by circling the wagons around anyone who's opinion they don't agree with.
So what you end up getting when asking questions is filtered opinions at best that don't paint the whole picture.
Like mentioned above I also advise using pm's to keep people off your back/find out the truth.
Yes I'm bored at work and this post took me right up to leaving for the day, lol.