The whole point of the ghostlight is that it should be able to slot right into scenes and function as a penis in such a way that we have to do minimal accounting for it, lest we run into the issue of "I have this strap-on but I can never use it because writers don't account for it"
The base assumption of "if this character has a penis, they can ejaculate" is one that's so fundamental and helpful from a writing standpoint that there's not really a chance of us ever actually discarding it.
I'm curious, can you tell me what made the hardlight strapon in TITS different from a writing standpoint? Did the staff working on CoC2 decide that what they did with the hardlight in TITS wasn't worth the effort in retrospect, so this time they're gonna do it differently?