There isn't enough time for several projects. And over a distance of several years, this becomes obvious to the author himself.

I often notice that a new project is planned in a genre adjacent to the old one. I don't understand the point. There is an exception - opposite stories. For example, when you do rap and open a new project for ambient, or play guitar solo and in a band. Then it is justified. For everything else - it's excessive.

Dozens of projects arise and fade every year. New names are hard to promote, the music industry is oversaturated, and new names get a hundred times less attention.

I remembered two opposite examples.
1) Moby - since 1990 has been making techno, trip-hop, downtempo, house, ambient, alternative rock, and even punk rock. One name. Nobody is bothered by anything.

2) Daniel Nakamura - created a dozen projects: for each collaboration or out of some personal convictions. Nothing long-lasting. Something became popular in narrow circles, but almost always it's a bunch of lost projects for one EP. He published under the names: Pillowfight, Dr. Octagon, Deltron 3030, Dan The Automator, Lovage, Got a Girl, The Automator, Men Without Pants, and The Overlaps (and that's not all).