I remember when we were discussing gender boxes a long time ago I wasn't really sure I wanted it but now that we have it, I'm really glad! Like a lot of people have said, it's great for project breeding ..and Wyndy, as a large breeder it's no less frustrating to open 8 boxes and get 7 of one gender and 1 of the other LOL I still have to feed all those, too
One thing I'm really appreciating most about it is that I can limit my number of lives in shops (thinking of even going box-only in the market shops). This is a bit less food to buy, fewer servers to worry about (I go through A LOT of food and have a lot of food servers

) I'd rather feed my productive cats than lose money feeding a cat that sits in the store for 90 days or more; now I can just keep sale cats in the gender-box and not have to worry about the food expense!
Anyway, someone said it's a "happy medium" since you can choose not to use the options at all, and I think that's a key truth to the whole thing. It's nice to have the option to turn off gender or 2d or whatever feature it is you're concerned about.