[NamTaf]

No, it’s not easier to work with, unless you consider your work done completely once it’s manufactured without a thought to the ongoing testing and inspection regime required. And even then, laying CF is more niche than welding metal.

Carbon fibre is a ply. Plies are much harder to nondestructively inspect for flaws. That is an immediate, obvious risk in a use case involving cyclic pressure of hundreds of atmospheres. It is also brittle, so strain deformation does not occur nearly as much before fracture.

Welds are a vastly more well-understood feature that is possible to easily design around and - more critically - inspect afterwards. Metals also stretch before snapping, which is why you can go and measure the spacing of links on your bike chain and know when it’s time to replace it. All of this makes through-life maintenance and inspection much easier.

Carbon fibre was an incredibly poor design choice, selected to prioritise cost over safe operation.