The FHT upgrade was never made because there is no use for a short range low health unit in the late game.
I don't understand why some people keep bringing up the FHT. The two units are worlds apart. Just because something did not work for one of them doesn't mean it won't for the other.
I have to disagree on this one my friend. I used the FHT a lot, but having to spend 200 mp + 40 fuel to get my FHT was too much of a burden for me to ever use the unit again. It's true that it's a low health unit in the late game, but the power of it was great while you could get it without the BP2 requirements.