As Speckle allows us to move away from file sharing, we can allow ourselves the freedom to think differently. It may be helpful to reconsider what the sharing model and methodology really need to be.
Share what is relevant, focused and useful. Receive, in turn, what you choose (encouraging collaborators to share in kind)
To your example, If you share only the bones of the project relevant to your electrical planner, and she/he, in return, shares only their new work, then this is the most straightforward method of avoiding conflict, being more nimble with iterations etc. Inevitably if they need your geometry for hosting conditions, then some of your original data will come back ‘over the fence’. Speckle connectors can do a good job of reconciling this.
There have been several models of sharing with individual streams across streams, branches and subbranches to allow for different forms of communication/sharing. It will be worth exploring what works for your team.