The version of directx in use has essentialyl zero impact on cheating, and there's no other way it would "do better." because it wouldn't look/run better on a newer version of directx without redevelopment of assets themselves. i.e. a full HD remaster. But good luck with that.
Also, technically correct is not actually the best kind of correct, it on'y makes you sound silly when you know what people actually mean with what they say. Even most of the people who use windower (which isn't actually everyone like you suggest) are not using it to harm anyone else or gain anything that couldn't otherwise be gained normally. i.e. by poshacking, duping, etc. Those people are using it to offset deficiencies in the UI that SE either can't or won't fix. (Such as the fact that it isn't scalable and on today's screen resolutions the stock UI may be too small for some people to see clearly, for example- should those people with crappy vision be punished for using a tool to make UI elements easier to see when SE hasn't implemented any sort of accessibility features?)
In short, I reject your argument that "everyone' is cheating because "everyone" uses windower. Most people that use it are using it for quality of life stuff, not to dupe items/wreck the economy/warp around the world/become invulnerable/etc. They have no intention of harming yours or anyone else's game experience.