Different devs have different preferred ways to work and collaborate. I doubt the FOSS community will converge on a single solution. I think we’re at a point of re-decentralization, where devs will move their projects to the forge that satisfies their personal/group requirements for control, hosting jurisdiction, corporate vs community ownership, workflow, and uptime.
This is due to increasing competition in the source forge space. It’s good that different niches can be served by their preferred choice, even if it will be less convenient for devs who want to contribute a patch on a more obscure platform.