I respectfully disagree, on the basis that normal deadspace pockets exist within a solar system and are still part of it. Abyssal Deadspace pockets seem to be… somewhere else entirely, somewhere that doesn’t seem to be at all related to where or when a filament is used.
For instance, say I use a filament in Jita. It takes me to somewhere that seems to be quite definitively Not Jita, in that it doesn’t seem to be physically located anywhere in the vicinity of the Jita system. Now, given that I can only ever use a filament once, it’s impossible to say if it would lead me to precisely the same place it does in Jita if I had used it in, say, Sobaseki or New Caldari. I could also be wrong - Abyssal Deadspace pockets could somehow actually be physically located in the system, and the filament is merely a means of accessing them.
Either of these possibilities has truly staggering implications on almost everything we know about FTL travel.
If the pockets are physically located in New Eden systems and the filaments are merely means of accessing them, then that must mean that these pockets have been there since before the rise of the Amarr Empire, at least, and there must be dozens of them, in every single system in New Eden, unless there are some specific systems in which filaments simply don’t work. So far I haven’t heard any reports of this.
If the pockets aren’t physically located in New Eden systems, then that means the filaments are capable of reliably and consistently producing a spatial phenomena capable of transporting a ship many lightyears to a very specific point without specialised permanent infrastructure or shipboard equipment. To this day, no technology we possess is capable of doing this.