I noticed that President Nelson has moved away from the traditional temple dedication. Meaning, for years it was President Hinckley and then President Monson when they both were the presidents of the Church.
Since President Nelson was called in January of 2018, only 3 temples have been dedicated by a member of the first presidency. 2 by President Nelson and one by President Oaks. Alll of the rest have been done by apostles.
I just found it interesting. I suppose with so many temples in the works, it puts an extreme burden on the members of the first presidency if they had to do them all.