Kholi and Smith are extroverts who presumably desired the job.
Introverts can of course lead and do an excellent job of it.
But leadership and captaincy is not for everyone. I do not understand the philosophy of the best player in the team should be the next captain. Many great players were not made captain or got rid of the captaincy so as to perform better. Many performed better with captaincy. New Zealand does not produce anywhere near the same number of world class players that India or Australia do. Williamson is different Smith and Kohli. Go back 40 years, NZs only world class players have been Hadlee, Turner, Crowe, Cairns, Bond and Williamson (soon to be joined by Boult hopefully). There is a long history of tension and unsavoury politics and incidents involving those players with NZ Cricket and NZ public (bar Williamson). You may argue to add Vettori in a limited overs sense to the world class player list. That may seem like a lot. But think about Indian and Australian greats in the same time period. Its not. Its not something New Zealand cricket regularly produce, we saviour and rejoice our Bruce Edgars, John Wrights, Mark Richardsons, and Chris Martins. The far less talented toiler Kiwi bloke is much more loved by the NZC administration and wider fan base. BMac has endured endless criticism for his approach and captaincy, despite leading NZ from the bottom to second and third for a whee while. World class cricketers do not fit the NZC mould. They are so rare. They are misfits. Making one captain? Novel - especially for one who is introverted. He will be blamed for not leading the team ont he field, even if tactically sublime and pulling in creamers at gully. How much better could Flemming have been as a batsman if not captain? Interesting thought.
Where India and Australia are no doubt incredibly passionate about the support of the national game and the the team that represents them, New Zealand main sport is Rugby where the All Blacks are mroe dominant than the Manchester United, Lakers or Yankees. It skews the mainstream's approach to national sports. While we don't burn effigies in the street of cricket players, we also do not pay millions of a dollars a year for the job. BMac gets $400,000 from NZ Cricket if he plays all games. Our media and personal can savage our world class players and captains. In the IPL world, I'm not sure KW needs that for $400,000.00, even if does not impact on his international run scoring game - which is by far the greater concern.
With no Ryder in the team, and god knows who will replace McCullum, maybe Nicholls who may fail, then M Bracewell, who may fail, the middle order of New Zealand is going to be incredibly fragile in the future bar Watling. That makes it even more imperative that Kane continues to score mega runs and nothing should be put on his shoulders that reduces his run scoring output.