My view of gender is, let's not throw out the baby with the bathwater. If there are inequalities between the genders (which there are), then we work to eliminate those. But even though I can't even begin to define them, I feel there are some basic differences between the genders, and I don't see that as a bad thing. It's just the way of the world.
One good thing about it is that it gives you people you can naturally bond with. A transfriend of mine once agreed with me that when you transition at my age you discover that you've joined a "little old ladies' club". Upper middle aged and older women naturally gravitate towards each other, and if you can be accepted in those circles, then it's a very fine thing. I've got many more friends and acquaintances now than I used to.
In my view, there's no doubt that men can bond with each other, but I think that women do it more spontaneously. E.g., not long ago I got on the train, sat down next to a woman close to my age, and within a couple of minutes we were chatting away and carried on for the entire hour and a bit that I was on the train. When you're female, it's easier to be less lonely.
You have lots of nice little moments. I know three cis women who are all good buddies and who get together from time to time for a girlie lunch. Once I came out, they started including me in their lunches. Nice.
And one of my favourite moments: once when I was on the train I needed to pee, and so I headed for the loo. Just before I got there a woman slipped in ahead of me. Then she seemed to run into a problem, started rattling the door handle and the lock, and a minute later came back out and said that the door wouldn't lock. I tried it myself and found that she was right. So I offered to stand guard for her outside the door, which offer she accepted. When she was done, she came back out and did the same for me. A bit of sisterly solidarity there, I said to myself.
Sisterhood is often expressed in tiny little incidents like this, things you might not notice if you're not paying attention. I'd hope that those who are saying they don't experience sisterhood might actually be doing it. Perhaps it's just escaped their notice.