Whats the point of the replacement
mostly to more directly build into the worries the Mina-chan from our protagonist has about her usefulness and how dispensable she is.
originally she wanted to have Satsuki be there in case she ever had an irreparable damage to her systems for one reason or another, but Satsuki still wanted to have her own place and purpose besides waiting to replace someone else.
the thing that kinda puzzles me right now is ... what is the bigger picture here? if all the rich girl robots are made to be their own existences, and also to have safeguards so that if they are tampered with they can alert about the possible activities they might be forced to commit...
is the guy who made those robots purposefully spying and sabotaging organizations that wish to harm human-robot relationships, specifically by using ones in the image of his ill daughter for that?
I guess the current purpose of making them must've changed to some extent, if he isn't using them to provide memories to his daughter (or at least not using all of them for that purpose), but it is weird that in order to protect the world he's trying to accomplish, he's using them in particular.
I was also going to argue a bit about only having them send a notice of terrorist intentions when the acts are being commited...but I guess they can't really pull that up for restrictions on their communication systems? I could understand some ethical concerns about the information that is transmitted, taking into account their autonomy in human relationship (until it involves commiting harm to other humans), but still. The fact that the best safeguard for a tampered robot is hoping other robots detect the risk signal it sends and proceed to plan in order to mitigate the damage is...optimistic.
Mostly since the only robots we see responding to it are robots without a purpose at that moment. Which would imply that, to some extent, if they don't obtain a purpose again, they're kind of "robot violence preventers" from that point on, until they end up destroyed during that duty. And that it is expected that at least some amount of robots end like that, basically as victims to continually build up pro-robot sentiment by helping establish that only robots tampered by a malicious human would damage others, while untampered robots would gladly sacrifice themselves to protect human life. A morbid thought.