defeats the purpose, of what?
Because there are many repairable tanks... no need for a repairable carto. the only difference is the fiber fill.
if you really like the filler, you can just buy a repairable tank and add the filler yourself. But that would take away from its full capacity.
The carto is designed as a throw away item, and thankfully priced as such. Why make it more expensive?
I keep a spare carto with me just in case my main goes bad.
It serves its purpose, i just dont see it being part of the already congested repairable market.
I've already replaced the coil on a Kanger H-coil carto, its super easy, and no solder required. don't see a separate product being necessary.
