Q: But what about breedables (again)?
A: If you buy a brown cat, and a blue cat (as examples), as long as you knew you were getting a brown cat and a blue cat at the time of sale, this is acceptable at the present including the various unknown traits they may come with or develop. Secondarily, when those cats make little kittens with unknown outcomes, this is also acceptable. Lastly, the resale of any breedables will require at the time of purchase that the purchaser knows what they are purchasing at the root level (for example, it is a blue cat).
If a breedable creator told you,that you were getting a brown cat as a starter,they have to sell it that way.I don't think it pretains to random generated traited starter breedables,since it's a random scripted starter for life simulation.Also, it's rare anyone premakes set starters anymore,so breedables possibly won't be affected anytime soon,except those that do premake set ones.
Also,there are lindens that do breedables and know how they work.So they will adjust info as needed,I'm sure.