>>44911344Because helmet is usually secondary. It needs to run max speed investment to outspeed base-100s, and the extra bulk doesn't make much of a difference. With or without the bulk investment, it still gets 2HKO'd by Urshifu.
Also, uninvested 130 base attack isn't that threatening. It needs to run 252 attack to threaten a 2HKO on Urshifu.