What are these insects on my hydrangea? are they beneficial or harmful?

I do not recognize them by name but could be acting as pollinators attracted by the hydrangea paniculata's bloom scents. Paniculata blooms attract bees, flies, etc. I get these visitors on all panicle shaped blooms and with the other hydrangea species that have lacecap blooms. The scent is very light to my nose; most noticeable early in the morning when it is sort of cloudy. If you can visually confirm that they are not causing any bloom or leaf injuries/damages, I would just let them be. I could not detect any problems to the plant in the bloom pictures; the sepals looked fine but the smaller fertile flowers turned fuzzy/unclear when I tried to enlarge the pics to look at them....

They look like flower longhorn beetles, possibly Strangalia or Typocerus. I think maybe more likely the former since they look more tapered but the pictures are not clear and I'm not an expert. The adults would being going for nectar, while the larvae are wood borers.

https://bugguide.net/node/view...