While DPS is an important metric for some jobs, it is often just one of many, and the problem with DPS meters is that it only shows you that one. It is often times more important to be doing the RIGHT thing than doing crazy DPS, especially in this game.

DPS numbers led to some really toxic behavior in WoW, and anyone who played that game at a high level inevitably got exposed to it.

I support being able to test your DPS against a dummy, or even get your own score that only you can see, but I strongly advise against any kind of 'scoreboard' like WoW had where people could see their entire teams' numbers. I have no doubt it would lead to the same toxic behavior here and the result will be far more negative than positive in most cases. Which is why I assume the developer of this game has refused to implement it, even though they easily could.