Hehe, my first Android phone was a Xperia SP. I liked it a lot but it was too big for me... There's very good support on Xperia phones too so yeah... maybe you should try the newer Xperia phones, the ones you mention are Sony Ericsson phones... They have improved a lot!
I really don't understand the point your trying to make, please explain to me why it would matter if more then 75% don't know how to unlock their phone?
Isn't that the same with any brand...
Besides... on the Sony sections on XDA there are MUCH MORE people than on this forum so.... Even if your argument is valid, it still isn't