and well i'll offer my suggestion to better the striking dummy system: instead of "kill this in a certain amount of time" you could simply switch it to it times how long you took to kill the dummy. you killed it in 1 min 30 seconds, well then you try a few different things and oh you killed it in 1 min 20 seconds this time, you can see that you improved. Would that be satisfactory for people? it could avoid all the numbers while giving you an indication of dps improvement.
and maybe you could set an option that there could be random aoe's you have to dodge or mechanics that could help you improve reflexes. Also a tank dummy would deal damage to you so you have to learn how to rotate cooldowns while dpsing, and maybe healer you have to heal a dummy while killing a different dummy to get the feel for managing both, basically making things more realistic to actual boss battles. idk there is a lot they could do with it and I think they definitely need to improve the striking dummy system.