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I don't disagree with you that all should have keys and should be ready to pop chest one bit. ^^ Doesn't always work out this way of course for everyone though, so you get folks that help check boxes and such.
Yep I already know the o'l "stand on a pyxis" method. ^^ The suggestion is about streamlining the process so folks don't have to do that. I'll say once again, if it's a 2hr box for the Cleaver to pop, imagine if the person checking the box could identify the box without having to say where it is or stand on it due to that fact that there's a visual identifier handling all that for ya. If there's TE's that need poppin and they have keys, then no, there's no need for communication or flagging.
Whether it's a graphic label or different colored boxes like Wish suggested(though the colors alone wouldn't tell ya how much time is left or how strong the light is/rank the chest is with just a glance), "streamlining" a process is all about improving efficiency. The very same as what just happened with the Atma infusion menu. Did we need it? Not really, since the menu worked "just fine" in terms of locating and selecting 3 Atmas from page lists. Are the new menu options faster at infusing atmas? Yep. The time it takes to infuse Atma choices has dropped dramatically.