The problem with that is that it will push people back to DIY transplants. The same thing happened when the FDA changed the rules for FMT and the number of people doing it at home surged again. The FDA doesn't really know what to do about FMT and it's pushing people to complete at home transplants with untested donors and therefore putting themself at increase risk of adverse outcomes.
Oh, I agree -- I don't know how to handle the problem either, and since the majority of our cells aren't human, there are plenty more microbiomes waiting to be transplanted (e.g. skin, underarms, feet). The incentives are incredibly perverse, with drug companies wanting to spend as little money as possible to develop drugs that appeal to the richest consumers, e.g. copycat drugs for old men who still want to get it up for their young mistresses.
