Well you dont have to use that format if it doesnt work for you, but it does work for others.
It may only be 1 hidden tab that just has general discussions on long term aims and plans, op planning, and discussion of members for internal that arent active etc, that 90-95% of the alliance have access to, but you dont initially let new members have access to the "long term plans" section of the internals in case they are just passing through, they would still have access to ops tabs etc, just not the long term plans side of things.
the system does work very well for some. depends on the alliance and the people.
To elaborate a bit, i think this only really works on small(ish) alliances where the players involve are either reasonably experienced, or have good thoughts and plans
The way we worked it in en70 was one hidden tab, and it wasnt really used for heavy council discussions as we were only a small alliance, we kept our numbers deliberately sub 30 members at all times, and we always knew we were merging with maybe 20 people going into the merge.
So the hidden tab was initially accessible by EVERYONE we had brought from our previous world so they all had a say in the direction of the alliance. Then as each newly recruited member proved their worth, commitment etc, discussion took place on the "hidden tab" to move them to full access and they were moved to full access. By the end pretty much everyone had access to it. And its primary function was only general plans, long term aims, and discussion of members to either move to full access or internalise (that was the only two real options
)
So for instance, in my guys next world, EVERY player that has played with us before in the previous world will automatically get internal access, will only be new recruits that wont, but gradualy they will be granted access as the world progresses
I can see how it might have worked somewhere like Syndi which stayed around the 70 member mark. Maybe their "council" initialy was 10 players that had played together before, who discussed the goals and aims and general tactics, then as each player proves their worth they get added, and before you know it, your entire alliance has internal access
But it wouldnt really work in a huge MRA as it would just lead to chaos. A smaller alliance where they understood what that extra access was about it worked fine.