Why is AMR suggest using T-19 set? (Restro-Druid)

https://www.askmrrobot.com/wow/gear/eu/antonidas/kokuru

Amr still suggest that I use my old T19 -875 - 2P - items.

Are those 4k mastery that good? The rest of my gear is arround 915.

It’s possible that the 2pt19 is still worth equipping. It’s a very strong set bonus, especially for a 2p, and can be worth a chunk of ilvls, especially if you’re not replacing really strong slots. If you share your Gear Export string from the addon and tell us which gear strategy you are using, I can take a look and see if there’s anything really amiss.