Agreed. However on the flip side when characters are used a lot we get more variety.
Nightwing must die was something I enjoyed a lot.
Since Rebirth began I've been spoiled by writers with what they done with Damian from the different Nightwing writers to pet rescuing in Dc Showcase to the horror tale with Grundy to Shadow/Batman, to finding peace in Nuclear Winter, to his role in Metal and GR down to TT where he loses faith and tries to do thing's his own way which ironically = doing the same thing his dad is doing in his title [Glass is a cheeky man]
It's all been fun and I'm thankful for the variety.
I think Deathstroke has evolved to more than TT villain status at this point.