Use all the stem cells you want, until you want them from embryos. If it takes embryos to give you your life back, the math, not to mention the morality, doesn’t add up.
What about a stem cell that is taken from an embryo without killing or harming it?
No matter what women will be having abortions - it can not be stopped. There are tons of reasons for it including to save the mothers life.
There are circumstances that this opportunity should not be wasted for just to blanket a statement like “Use all the stem cells you want, until you want them from embryos.”
If the baby is going to be killed for a few reasons that are acceptable then let it be not in complete vein.
The world is not black and white and using absolutes in any case should be done with a great deal of caution.