I agree with all your points, except the last one. Admittedly, it is still rare, but there are companies out there that, using industrial machines, manage to get close to or (in case of the linked one) exceed injection moulding in tensile strength, and are achieving near isotropy using FDM processes. https://orion-am.com/blog/orion-am-news-1/3d-printing-peek-stronger-than-injection-molding-12
Disclaimer: I work there. However, this article has independent test data that has been verified by 3 different labs by now.
There’s no data on those, but we did at some point print air tight (0.8 bar over a week iirc, no vapour smoothing) in abs, so it may be similar. Consumer grade hardware of this sort is probably still pretty far away, but it’s not as impossible as many believe :)a