Why do people keep thinking direct sequels to Zelda games are rare or don't happen frequently?

Zelda 1 had Zelda 2

A link to the post had links awakening

Ocarina of Time had majoras mask

Breath of the wild had tears of the kingdom

A link between worlds was kind of a sequel to a link to the past and links awakening

Wind waker had phantom hourglass and Spirit tracks.

there are a lot of direct sequels