Like the title says, I wish that players from Tier 2 or 3 can't invite lower Tier Friends.
It's just not right that inexperienced Players joins FSC and they have everything below 3*
As long they didn't passed the gate in the clockworks from Tier 1 to Tier 2 or/and Tier 2 to Tier 3 they can't be invited to the Tier they don't have access.
Same goes for the missions just with a difference:
Only players who unlocked the mission can be invited like the example shows:
-One wants to do Vana mission but hasn't unlocked it so he can't be invited by someone else to do the mission.
-One wants to do Vana mission and has unlocked it has the right to join it.
Like the Spiral HQ says, they want only experienced Players with the right equipments to join the harder Missions or Clockworks and not inexperienced ones.
I'd rather they either get a warning, or that lower tier players be completely blocked from JOINING a friend from a higher tier.
I have no problem with inviting lower tier party members, just as long as they can't join of thier own accord.