That said, clearly we cannot include all the other SE sites. We have Math.SE because of how often it comes up. IMO electrical engineering makes an appearance fairly frequently. What do you think? Would expanding the list be worthwhile? If so, what sites would you like to see added? If not, I'd love to hear your pintpoint of view.
So I took a closer look at all of the related posts about this. (Thanks for the duplicate votes, by the way. But there were several other questions this was closer to a duplicate of; why that one?) Anyway, it seems that the question has been raised before about various other SE sites. For the majority, the answer seemed to be that those other sites were all betas. EE.SE is not a beta site, so I still think this is a valid discussion. Additionally, and it should be noted that this is an inference I am making, it seems from answer like this that I am not the only one who would be in favour of adding an EE.SE migration link. Especially since even last year it was the #2 site that questions were migrated to.
2 years later:
At the moment, I'm no longer sure whether or not it would be beneficial to have EE.SE as another migration option. I now know that, when I originally posted this, it was not worthwhile to make it an additional option; the rate of migrations that weren't rejected by EE.SE was too low. However, as it stands, in the last 90 days from the time I'm writing this, 39 posts were migrated to Math.SE with 2 rejections and 19 posts were migrated to EE.SE with 5 rejections. That's a total of 37 accepted migrations to Math and 14 to EE; a bit under half as many as Math.
Now, I wasn't around when our site went up and the option to migrate to Math.SE was already available when I started. But at what point will we admit there is sufficient volume to make a new option? What was the rate of migration to Math when we first decided to add that as a migration option?
It's been a couple years since I first, naively, proposed this. But in that time, the rate of successful migration to EE.SE has grown noticeably. This leaves me unclear. Should we reconsider making EE.SE its own option under the migration close reasons? Is it worthwhile now? If not, at the current rate of increase, there's no question that one day it will merit becoming a new option in the list. The only question you have to ask yourselves (and answer here) is whether or not we have reached that point yet. This I just don't know.