Project courtesy, advice when adding others observations to projects

I wouldn’t stress about it. I make tons of projects and have added tons of observations and no one has complained. People who don’t want you to do this can set their accounts to only allow them to add their own observations to projects. I’m always happy when I see someone add an observation of mine to a project - I feel like it must be useful to someone, then. If you add someone’s observation to your project and they don’t like it, it is very easy for them to just click it to remove it again.