Having kids.
I suffered from facial muscle strain for 5 days after my son was born. I was THAT happy to hold him 5 minutes after he was born.
Yes I saw it from the male form side of the process.
I seriously doubt the sound of another human's child crying will hurt my ears quite the way the sound of my son's crying does.
Will not actually giving birth to the child matter? damn right it will. If if isn't created in the usual fashion, you might as well stop pretending anything else will be the same. So what they used your eggs. It will NOT feel the same. Some other female will have carried it and that child will NOT be bonded to you at all. The infant could be raised by you, but, it will never be ore than an adoption.
You might as well adopt.
Me personally, if I could become pregnant, and have a child, I'd do it without a second's thought.
But I can't, never will know the feeling, and it will ALWAYS be a form of lacking I can't cure.
As a FTM I suppose it will feel different. But, I can't think of anything so thrilling about the 9 months I got to being merely a spectator while my wife did all the work, took all the risk, and suffered all the discomfort, all so I could have sore face muscles for a few days.
Yes, I DO find it awkward being called 'dad' when I am a woman in my mind.
I can't think of you really having an easy time getting mother's day cards after transition.
Giving away the chance to have seen the other side, well once that is gone, you can't have it back eh.
Really, in the end, that is the thing to consider. Not how it will make you feel while doing it, but, how it might make you feel looking back and seeing what you gave away.
As for the rest of your questions. Well so many things are really 'what's in it for you?'.
Not having breasts can be as annoying as having them. And breasts do tend to ruin an illusion.
hiding a lack of something in male swim wear is a lot more effort than hiding something that sure is there in a bikini

It's the reverse of breasts. Filling a bra is no fun with nothing to put in it. Going topless is a bit of a problem with very obvious breasts.
Going bottomless is a major obvious limitation with the wrong part.
Thus, I don't think expense or how it will feel is relevant. How much do you need it?
Straight girls, well you will find, that finding a person to want you is not easy regardless.
Love is like that eh. So people have to get married several times to find someone worth having.
Some get lucky on the first try.
How do you tell a girl you are trans? The same way you tell them you are anything else tricky. Like religious, or non religious, or a spy, or into out of the usual sex interests, or obsessed with large families.