“This is the fifth time that Shuri Castle was destroyed following 1453, 1660, 1709 and 1945”
https://en.wikipedia.org/wiki/Shurijo#2019_fire
Those dates would seem to indicate better building techniques are needed.
Also is interesting to see the dates and wonder about the cycle of instability and fighting - assuming the previous losses weren’t just an accidental fire like the most recent one.