This is in regards to solely the rank 50 dungeon (mostly because I'm still confused about having a rank 25/30 dungeon with no level cap).

I understand the idea of having a minimum entry requirement regarding the number of players attending. But isn't making that number at precisely the maximum number of possible players in a party extremely limiting? For example, saying you can't enter Limbus without 18, or Salvage without 12, but having those also be the maximum number of entrants?

If you let parties of 6 enter, even if the dungeon is too difficult, at least those 6 players can give it a shot with the friends available. Make some progress, hone their skills on the early part of the dungeon until time runs out, acquire some SP/rewards, etc. My concern is having those 6 available and then being required to randomly shout for an additional 2 (if those could even be found). Currently in FFXIV, there isn't a mechanism to do that in any way that isn't utterly painful. And I can't imagine anything more frustrating than having 7 members ready to go and simply not being able to find an 8th, in a game that literally has zero other content for rank 50s.

So, am I missing something here? I think someone brought this up before, but a linkshell with something like 15 available players will only service 8, while the remaining 7 are out of luck (or have to find the aforementioned random dude). This obviously gets more difficult as the remainder of available players deviates from multiples of 8.