I can understand that, but the threaded history is sort of useless if you have to delete stuff to make it work...it's no longer a thread. I don't restore text messages...ever! So I'm not one of those morons either, but it got to be frustratingly slow after just two days of texting (100 or so messages).
I guess HTC just implemented the new messaging app poorly as it neither archives messages or lets you start typing before loading all previous messages.