My opinion is that natural weaning is the preferred way to BF.
[ponders whether I have time for all I want to say]
Both mine naturally weaned; DS1 at 3 and DS2 at 4. I went into motherhood very keen to BF, and with an open mind. I never for a moment thought I would do it for so long, I hadn't really thought about it tbh.
There were times when I wished I'd knocked it on the head at a year old.
There were times after that, that I just wished I was DONE.
But most of the time it was lovely, and I look back fondly (they are 23 and 13 now). Physically, naturally weaning meant I never knew when the last BF was - for a long time preceding they'd be nursing maybe only once every 3 or 4 days.
My body adjusted as it went along and I feel I gave my boys what they needed.
I was working full time for most of the time I was BF and it helped with my relationship with them I think. It's the one thing that only I could do and to reconnect in that way benefitted us.
After about 2 years old I didn't really tell people I was BF. They didn't need to know and I had a good network of supportive friends and family. I wasn't hiding it, but kind of got fed up of people trying to dump their own issues on me by saying e.g. "Oh you're so lucky you can BF, I had to give up after nnnn because of xyz", or "they don't really need it after n months". I could quickly tell if people were open minded and actually wanted to hear what my opinion was and was then happy to talk.
I do admit that I felt slightly uncomfortable thinking DS2 would start school before he weaned, not because I thought he was too old to BF, but because I didn't want him to possibly put himself at risk of teasing, if he told people he had Mummy Milk at bed time sometimes. In other cultures it would be fine, but I don't think many 4 year olds in the UK would understand, and the last thing I wanted was for my DS to think he was odd because of it. It was a non issue anyway, as he weaned about 6 months before school.
If I see a child of 3 or 4 BF I admit I look at them and think they look big, but honestly, when it was my child, snuggled up in bed at the end of the day it felt absolutely perfect.
I never had a negative comment about BF in public, only ever a few positive ones. I never had anything more than a blocked duct so I feel fortunate in that respect.