They not only change the major doctrines but the minor ones too

"You should never offer flowers to the Gohonzon" -- SGI/NST member

"The offerings of flowers and incense really means the offerings of evergreens and incense." -- SGI member

"Shakyamuni Buddha and Nichiren Daishonin said flowers but they meant evergreens." -- NST member

"Whether you chant the Buddha’s name, recite the sutra, or merely offer flowers and incense, all your virtuous acts will implant benefits and roots of goodness in your life." -- Nichiren

"Offered all kinds of flowers...as alms to the Treasure Tower" -- Lotus Sutra Chapter 11