With a 93 year old prophet, changes in the presidency make sense.
First, Elder Uchtdorf is younger and more capable of traveling. He especially can benefit the members in Europe and Russia with his experience.
Pres Oaks, as second most senior apostle, will benefit from the experience of being in the presidency. Being almost a decade younger than Pres Nelson, he likely could be our next prophet. His experience in law and education will be an asset over the next many years.
Of course, Pres Eyring will continue providing continuity. He is now 2nd counselor, probably for deference to seniority among the apostles.
These three have served together a long time. They know each other, respect one another and work well together. They will provide a unified direction for us. Elder Uchtdorf enhances this unity by humbly stepping back into the Quorum of 12, and sustaining the new presidency. That is the mark of a true disciple of Christ.
I look forward to the inspired direction they will lead us in?