Why does Naruto no longer summon Gamabunta in Boruto?

Why does Naruto no longer summon Gamabunta in Boruto? Is it possible that he doesn't require his assistance?

During the 4th Great Ninja War, when Naruto performed summoning jutsu in a three-way impasse, he summoned Gamakichi instead of Gamabunta. Gamabunta was claimed to be 'in the middle of commercial discussions.' Either he was making money in his retirement or Gamakichi used a euphemism for his grandfather's age.

Naruto also has the option of summoning a fox, which is 100 times more powerful than a toad. He even separated from Kurama in Naruto: The Last.

But I do miss this guy...

Remember when Naruto and Jiraya were just studying summoning Jutsu? Great moments.