DPS test training dummy

Hear me out. I know we have POB and DPS numbers on spells but imagine how nice it would be to have a training dummy in your hideout that you could attack with different gem setups to test actual DPS numbers on a boss. Similar to what world of warfcraft has for example.

Followup to this:
Have the dummy display the actual damage numbers onscreen. Once per second, for instance.

This has been asked since 2013, it will never come to poe.