So are heart transplants and organ donations and every other type of modern medicine breakthroughs.
The difference is that there is a traditional way to have babies. There is no traditional ways to have heart transplant and organ donations.
Heart transplants and organ donations canot be be equated morally with reproductive concubinage. The “modern” “technical” aspect of surrogacy is not what makes it objectionable. It’s the depersonalization and demaritalization of reproduction -— distorting procreation into being both a comemrcial transaction and a laboratory breeding technique -— that makes it objectionable.