The age old problem when making builds, having to reforge an item so it works in a separate build. We all know it's an issue and continues to be an issue. It is also unfair that some players don't have to reforge as they were able to make the singular investment to just make a second of the ancient, such as poly or evo. There is no reason to limit players who are already struggling with gold on other items or legendary mats if an item they have would help them run two different content in two different ways.
A good example would be codex. If you are in t18 and want to beat clover d4, off codex is an amazing option. And if the persons main build happens to be defense codex vamp? The answer is fuck you hand over the 100 leg mats EVERY TIME. Please kong we are begging you. Either one let us have it.