Being a person who actively used attachment plates, I don't consider using APs to get custom angles abuse. I don't think
something like this would be hurting anyone (other than myself) if I used it.
I obviously don't speak for Frozenbyte, but I
think they agree that it wasn't really abuse, judging by their use of my planes/submarines in promotional material, including the
EA trailer. Again,
this is only my speculations, and I think my not being on the official discord only cements that.
That's not to say that people did abuse them, I remember people have made "springs" to absorb collision damage with attachment plates.
If I'm correct, you can still achieve that same result with beam welding, though it wouldn't be nearly as compact as with attachment plates. This raises the question, why not just fix the stress system, instead of deleting a feature outright? I don't work for Frozenbyte, so I'll leave the answer to them.
Though I do remember something you could only do with attachment plates, it's hard to describe in detail; it's more like an eldritch horror than a ship. I like to strike a balance between eldritch and ship for my builds, but that...
thing? It scares me.