Thanks Brian, the default environment must have backups? Microsoft wouldn't be able to sell the service if it wasn't being backed up by them. Maybe I misunderstand. When mentioning Governance do you mean controlling what people can do in the environment? That's not governance that's restricting tool functions and my preference would be to set useful guidelines. What I heard is that custom environments means you don't get all the features that you're actually paying for but that could be incorrect. Deployment changes of? This is off the shelf software and really shouldn't customize COTS IMHO. That means lots of money for consultants and third parties. I would rather extend using standard APIs than customize a tool.
Here's some things I was pulling together when my org was talking about using custom environments. A bunch of this comes from Claude.ai and ChatGPT and I haven't verified it so feel free to correct it!
https://github.com/thephm/microsoft_tech/blob/main/planner%2Fposts%2FMS%20Project%20for%20the%20web%20in%20custom%20environments.md