The honest version: it works, until it has to be someone's job
A partner exporting contacts and asking Claude who to reconnect with will get useful answers. The failure is not quality, it is upkeep. Doing it monthly across a partner group means someone re-exports, re-pastes, and re-prompts every cycle, and that person's enthusiasm is the single point of failure. Systems that depend on discipline decay. Systems that run on connected sources do not.
The thing a session cannot do is be shared
The value of firm relationship intelligence comes from the overlap: your colleague already knows the CFO you have been trying to reach for a year. That only surfaces if everyone's relationships live in one permissioned place. A general-purpose assistant works on what one person hands it in one session, so the overlap that matters most is precisely what it cannot see.
Nothing learns if nothing is recorded
Ask an assistant twice in three months and it has no memory of what it suggested, whether you did it, or how it went. That makes each answer a fresh opinion rather than a system improving. AVNIR records recommendations and outcomes so that whether an introduction actually landed changes what gets suggested next.
Worth asking your risk committee about
This is a question rather than an accusation. A DIY approach means individuals decide what client information gets pasted into a general-purpose tool, case by case, with no central policy. Some firms are entirely comfortable with that. Others discover they are not, only after it has been happening for a while. Either way it is better answered on purpose than by default.