Tower Shield usable by Xbow hero only?

[cwifterthanswift]

It says on the website that the Tower Shield is usable by all T4 X-Bowman(sharpshooter) and I think that the Tower Shield should be hero locked only. Because the tower is such a good shield and i think it is kinda pointless to somebody with the second best shield in game(unless impervious is better) having only 4 shield skill even if they can give it to somebody else.