It should delete from all Sandboxes.

This is a quick work around: You can always create a new SegmentAdd your Segment (under Audiences)Click Convert to Rules (on the right side of the Audience Name)Change the new Segments Evaluation TypeSave as a new segment  

I see.  You may want try defining your segment in such a way that people fall out of the segment based on what you are trying to do with the realized state. Second, you can do what you are looking to do, but: It is a bit cumbersomeYou may run into scenarios where the underlying segment is resolved a...

@Ikmoo It is easier and better to use the Audience tab.  It helps when the segment job is running to ensure the segment membership is up to date.

Please remember, Privacy Service is meant to help you manage customer data requests specifically.  Meaning it is meant to handle compliance with legal and organizational privacy regulations only.  Please use it for this only. https://experienceleague.adobe.com/docs/experience-platform/privacy/regula...

You are right in that you cannot speed up Segment B (batch).  However, you can decouple Segment S from it.  This allows you to react as fast as possible to the incoming events. This has a great benefit in that Segment C can update as Segment S is entered in a streaming fashion but it will use the mo...

@tksol95 No.  ECID should behave the same as the rest as long as it is flagged as an identity and that identity has a namespace of ECID.

There is a lot to unpack in your question and I’m not sure this would be the best format to do it.  In the end, the answer will be “it depends”.  As such I would recommend reaching out to our Consulting group and/or our partners to dive into your specific use cases and data structures for the best a...