I don't think that I suggested rebuilding compliant platforms. Merely that where the horizontal gap is far greater than usual due to tilting trains (which are likely to vanish post-HS2) it may be worth closing the gap to something more typical. Presumably there is a limit to how far Stadler steps can extend.But, if using the stadler solution you don't have to raise the platform, as it provides level boarding at the platform height for the current standard platform height, so why spend money completely rebuilding the platform if you don't have to?