On purely ideological grounds, I can't see why anyone should oppose the process.
Me neither, but I went to a London Vegans thing once where a speaker talked about milk (and meat) being produced in this way and there being a general acceptance that this was abhorrent. It wasn't really explained why.
Anyone have any ideological opposition to these products?
https://www.theguardian.com/environment/2016/sep/13/animal-free-dairy-products-move-a-step-closer-to-market#comment-83165247
NB - don't read the comments, obvs.