I believe the reason that FL gave for moving its primary up was that it is unfair for a small state with demographics that don’t match the country at large to have so much influence on public perception. FL sees itself as “more important” or “more relevant” (than IA, NH, SC, and NV) and aims to assert its self-importance in the public arena.
And we can thank the perpetual 24 hour news cycle for all of it.