Well in abyessa when you are doing 3000 extra dmg, then yes skillchain damage is good. I find mine tp gain and VE are very close, I may sit on 10 to 20 tp at most before it Ws.

Many times I sit back waiting for trigger and go in while our tp is gaining with VV then do 8 to 9k dmg, so yes skillchain dmg is good.

outside of abyessa doing VS to AS could give you 6k dmg, I don't think any job can match that , considering how often we can do that. So again, yes skillchain dmg does matter these days.