Everyone's favorite magitech metal men!
Anyway, I don't think anyone is arguing that baseline warforged are anything other than +0. Living Construct gives some good immunities, and more constitution is always nice, but the innate armor adds a feat tax for basically every class and the racial support isn't amazing.
The obscure warforged charger is a 4 RHD, large-sized melee bruiser. It gets good (if physical-skewed) stats, free Powerful Charge and Adamantine Body, and the usual warforged immunities.
However, on account of relatively poor RHD, the complicated logistics that arise from Adamantine Body, and the mental stats which are poor even for a bruiser, +0 LA is fine here.
Essentially just small-sized warforged. Not great, if I'm being honest: the ability score adjustments are worse than the baseline race's, and don't fit many classes.
That said, warforged scouts definitely have their niches over the default form, and are fine at +0 LA.