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Not everyone has 8 friends who also play their exact same video games. I don't think it's really an unreasonable convenience due to that factor. It needs sensible and extensive limitations, yeah. I don't think anyone is arguing against that.
Design the family system to not be abusable by pick up groups or guilds. Make it very difficult to swap in 'new' family after the initial has formed. Limit range of the teleportation by some reasonable amount that doesn't limit convenience. Only let two assigned members of the family have the ability to do the actual calling. Have significant cool downs. Don't let people carry anything in inventory other than their gear. These are some basic limitations nearly any conversation that discusses the family summon system have brought up, basically every time.
I feel like the design parameters and possible flaws for basic alpha 2 testing are so well known and talked about at this point that it can be expected that IS has a very clear set of things to watch out for and tweak. And hey A2 is a testing phase. If it breaks a part of the game, patch it, and if it can't get 'patched' then delete it. But not testing is just hamstringing what could be a very reasonable compromise that would helps make the game competitive and attractive to casuals. That means more money for IS and more content for hardcore players in the long run.
Much like corruption, I'd find it weird to give up on certain untested systems without actually doing extensive testing. Hard to go 'yeah this has a negative impact on this situation' without background testing data to compare to first.