I am in favour of gender selection. It used to really rile me how some people (usually always women who had a boy and a girl) would guilt-shame me for having a preference over what sex my 4th child would be, when I already had 3 of the same sex. In the end, my 4th was of the opposite sex, but I would definitely have had gender selection afterwards if not. I pay for all my kids myself, I don't even get Child Benefit, and it wasn't just me who yearned for a child of the opposite sex - it was my husband and children as well, so I would have had no problem paying to ensure our family was made complete. If the science makes it doable and you have the means to do it, bring it on.
I think having a gender preference is a completely normal feeling, especially when you already have multiple children of the same sex. It's just people's reactions to it that makes it feel like a dirty little taboo secret. Unpopular opinion