TUC shows a further acceptance and mutual respect growing between the father and son.
Unfortunately, "Reunification" (TNG) seems to have undone all that. Spock said that "In the end the arguments were all we had."
This was posted under the TOS board so for some of us what TNG did to these characters happened in the alternative universe.
The arguments those logical, peaceful loving, cool, dispassionate Vulcans have are legendary throughout the galaxy. Those 2 didn't speak for 18 years, healed their relationship for another 25 only to constantly argue. Imagine that! Another example of trying to strengthen the weak by weakening the strong. TNG hoped to win the audiences love for the TOS original characters by making Picard the great uniter and the source of strength for Sarek. All they created was an inconsistent, irregular. insensible story line where the characters we saw were very different from those we knew from TOS.
Reboot time.