As for the green tea in supplements issue I have often wished that more clarification be given on that front, but I can see why leaving it to individual agency is also a fine idea. I can see the argument from both sides. On the one hand, it is an extract from a particular plant, but not the plant itself, and not being used in the hot drink form, for what that's worth. In this way, it might really be looked at more like taking vitamin C which is also a component of tea. Usually, EGCG is the main compound being referred to as green tea extract and it can be found in other foods such as apples - so does the fact that it was extracted from green tea make it wrong to ingest in and of itself when it's no longer part of the tea?
On the flip side, I completely understand the desire to avoid it as well. Modern revelation has made it clear that coffee and tea are what is referred to specifically by hot drinks, so even if it's not being had in a hot drink form it's still coffee or tea, at least insofar as say having an iced tea or frozen coffee treat. If it's processed, at what point does it (or is there a point) where it would no longer be coffee or tea? Might just be best to avoid it altogether. This position can be strengthened by the idea that for years caffeine was viewed as the culprit, but that may have been a case of members looking to scientifically validate what the lord has said and have nothing to do with what we've been commanded. To my knowledge, we have no specific chemical in coffee or tea that has been validated as the reason to avoid it, so in not knowing what components are the issue, perhaps it's best to avoid anything and everything to do with it.
While I can understand both sides, I personally opt to avoid supplements with green tea extract or EGCG knowing it was most likely sourced from green tea, but sometimes it can be a real pain because it's in so many things and has caused me to have to find new sources as it's been added to formulations I used to use and enjoy.