Plugin ID requirements for distributing on own website

Regarding the plugin ID, is getting a plugin ID from Adobe only needed if distributing a plugin on the Adobe marketplace? Or is that something I should be getting for plugins that I distribute to other people from my own website?

I realize the plugins will work if I just assign my own unique ID. However, I was a little confused about what Adobe is wanting developers to do for plugins they distribute on their own through their own websites to other people.

Also, if I create an ID through Adobe and distribute on my own then I would assume if I decided to distribute through the Adobe Marketplace at a later time then the plugin could retain the same ID. Is that correct?