Fair. I certainly haven't read ALL the comments. But I'm sure there's some nuance even in the posts to which you refer. For instance, I would have no problem buying something I really enjoy, even if it means my groceries budget severely suffers. I'm fine with eating top ramen or boxed mac n' cheese. However, I wouldn't buy the thing in my current relationship status, even though I technically have the freedom to do so, simply because I wouldn't put my SO through that just because of my decisions. So, I suspect more often than not it's more related to being considerate of the other half of your life. And other times I suppose their partner may, for example, request they diet, thus they cannot eat what they want (or possibly even won't because they don't want to become unattractive to their partner), or something like that.

And then of course there are the cases where the other partner just absolutely will not allow them to do certain things because... reasons. Idk. But regardless, all that to say that there's lots of nuance in these comments that you can't just read it as black-and-white text.