Actually, there are only a few pure winner-take-all states. Most of them have WTA by congressional district and WTA for the at-large delegates. So while it i not truly proportional, it is not strictly WTA either.
Winner-take-all by district is almost the same as pure winner-take-all in practice. The losing candidate only ever picks off a tiny handful of districts if any at all, no matter how close they are. Just see South Carolina and Missouri.
And see the Dems results in Missouri for what proportional looks like. WTA by district isn’t even close to proportional and almost the same as WTA by state.