The baby at the time of birth already has specified cells in his/her body-- say, cells that are totipotent to the formation/maintenance of bones. But with things like the placenta, the potential is great. And the best news is that you have an unlimited supply and it removes ethical concerns.
this possibility is only needed because people like you don't even understand how they get stem cells, or where the cells are coming from.
why would they need to do what you are suggesting if the embryos are going to be destroyed anyway? you have no logical reason to disallow it
The problem is that once you unite a spermatazoa with an ovum, you have a brand new life. I know you'll object, but hear me out.
its not new life its a combination of two genetic parts, and as someone said, the sperm and egg are alive.
the fact is you are trying argue something you really have no clue about