Dawnshard isn't necessary to read RoW imo. There are a handful of connections to it, but I don't think they are critical. There's a year between RoW and Oathbringer so those things should fit in pretty naturally.
You will know a couple details about how Dawnshard must end if you were to read it later. RoW doesn't spoil the most significant takewaways though. Depends how you feel about that.
alright cool then I'll wait!
---"undertale hangs out with mido" - ZFS
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