Originally posted by Kurk
SW universe hasn't:Figured out how to make iron-proof clothing (seen during TLJ with a droid ironing a pilot uniform lol)
Figured out how to easily fix far-sightedness (some characters still wear glasses)
Figured out how to grow limbs from stem-cells
Yeah TLJ just screwed some stuff over...
That said for the last 2, at least in Legends, they were clearly capable of doing so.
If they can grow an entire clone, they can regrow a limb.
There's also various eye replacements to increase/improve one's vision. Why a character wouldn't though, well maybe they just don't wanna go through the hassle and find glasses easier. It's not like this isn't anything new in our world, some people just find it easier to wear glasses than get surgery.
However, the cost to a cloned arm vs a prosthetic more than likely would be too much compared to just getting a prosthetic replacement. Cloning is expensive after all.
Or it's just against the rule of cool take your pick, so writers would rather have their character have an awesome robot limb, than a regular fleshy human/alien one.