I'm with you on the part of the transitioning at a very young age. However, I don't agree with social transition being permanent except in cases where the family lives in a small town. If you live in a metropolitan city, there are probably multiple grammar schools around that the child could attend. So, say a child born female transitions socially to male, goes by male pronouns and name. Then, as they get older (about 6th grade), they realize that they're not wanting to be a boy anymore. Instead of dealing with the trauma of having to have kids go "But you went by this name" blah, blah, blah, they can transition to a new school (or even be homeschooled) to allow them to live out their new found identity. Please realize with this situation, I'm talking about the child has been in therapy, the parents have communicated well with them, etc. Not one of those "today I'm a boy, tomorrow I'm not" things. We all change as the years go by and to say that one cannot socially transition because they may not necessarily want to be this way later, is wrong in my opinion.
Now, in terms of a child taking hormone blockers to delay their puberty, that's where my opinion differs. While I haven't heard of any adverse affects of this, I'd have to make sure my child was serious about wanting to be seen as the opposite sex before I did this. The only reason is because of the fact that it's been shown that many LGB members may experience gender dysphoria as they find their sexuality so we don't want to dump the hormone blockers on every child that displays dysphoria. Again, if the parents know their child well enough to see that this will help them, then by all means do it. But I'd hate to see the child in a situations where their puberty is delayed, then they get upset at feeling as though they look so young...Of course, this is just stuff that comes to my head when I think of children transitioning. I could kind of take either side on this, but doing permanent changes to a young child, is, in my opinion, wrong.
Edit: Since we're adding experience...I actually felt I should've been born male when I began puberty. however, I felt little actual dysphoria until later on. I wasn't depressed when I got my period (quite the contrary because I thought I was "mature". Lol) or when I got breast. It wasn't until I was about to start high school that I realized I coudln't take the torture of being seen as female anymore but adult me wonders if that was because I was starting to become attracted to females. all in all, I actually must've been preaching that I hated being a girl more than I can remember because I remember my mom telling me when I was about 9 that she was scared I was transgender after I expressed awe in a show about transgender youth (lol). I personally had no use for blockers because I didn't quite understand anything at the time.