Originally posted by GypsyComet:
The tech chart doesn't mention "difficult cases" but they are certainly part of SF. "Everyone's favorite" female naval captain (Honor Harrington) is one that comes to mind. She can't take regen treatments, and gradually accumulates metal bits throughout her career as a result. Captain Kirk is another minor example, being apparantly allergic to chemical treatments to correct vision.
For Traveller purposes, it's a color thing. Why does your character have a cybernetic replacement arm instead of regrowing it? Either time, resources, or a personal medical impediment, that's why. The Traveller universe doesn't do "because it's cool" even if *players* might...
I agree about the added colour of having "some" spacers with prosthesis. I have them IMTU.
With low berths, it is easy to freeze people so that their repair can wait till somewhere fully equiped, so low berths make cloned parts much more accessible.
I prefer prosthesis - I don't think I will be including low berths IMTU.
I still don't know where MTU is going to be regarding prosthesis.
Re: Honor Harrington, I would give an "effective XP" cost to cyber systems. She takes a couple of years to get used to her new face so that means she is spending her time re-learning things like walking, speaking, smiling etc. If PC's have to give up something (in munchkin terms) so that they can have bionic sight, it will at least make them pause. Alternatively make them buy it using a "feat" - until it is paid for, it is still sub-human (still coming to grips with it)
re: Honor Harrington's regen problems. It is used as a plot device. If you want some of the people IYTU to be "regen poor" then wave a wand (and do some handwaving - I liked the "base" gene sequence in my first post - but whatever works for you is good enough). Based on the hand waving, it will have other limits as well.
For example, if your hand waving is that some people have a very strong "body image" and their brains reject cloned parts as "foreign" even when there is no detectable difference, then tech won;t change that. However you may give these people a low level of inate psionic awareness as compensation.