Oh, just seriously got bit by this one.
Use case:
- Thousands of prefabs instantiated to create a level. These prefabs have particle systems, sounds, etc (self contained objects).
- Particle systems just for existing (even if not awoken and completely disabled) take a small memory footprint. This adds up to sometimes GBs of memory on particles that might never be played.

Solution:
- Have a pool of particles to be reused for each of those previous instances when needed.
- For editing purposes, work with the particle systems inside the prefab for placement, sizing, etc... leave this particle system as EditorOnly as it will be instantiated/placed later on dynamically on the parent of that Transform.

This fails then because the EditorOnly tag won't cull objects tagged as EditorOnly inside prefabs.

Is there any interest in taking a second look at this at some point? 'EditorOnly' is a bit misleading if it is only 'EditorOnly if the object is standing there on a scene'
Or maybe some best practices to do it as a build post process? when the prefabs get processed for a build?

Thanks in advance