"As for why modern life would make extended bf difficult, "other than work" means I can't tell you the main reason which is that I am at work for 8 hours a day."
But being at work isn't invariably incompatible with continued breastfeeding as so many people seem to think, at least not once bf is well established and baby is taking solids well.
Your dd not wanting to bf is another issue. I've not argued anywhere that babies NEVER self wean before 12 months.
If a baby wants to continue to bf (because despite your own particular experience, the vast majority of bf babies around the world who don't have the option of formula don't choose to stop bf significantly before 12 months and most self wean considerably later than this) then it's usually perfectly possible for the mum to carry on, if she wants to.
"I know you'd like to hear that I am internalising some strong anti-bf culture"
Why would I 'like' to hear this?
I have no idea about what goes on in your head or heart, but I do know that living in a culture where bf beyond six months is something only a tiny minority of women do is very likely to affect the way ALL of us feel about our own expectations and experiences of normal breastfeeding.
"that by repeatedly saying things like that (and yes, I know you were not directly commenting on my baby), quite often"
So if I'd expressed that opinion just once and not gone on to try to justify or further explain my view you wouldn't have taken it as a personal criticism?