When cookie-less tracking is enabled some features don't work for example:
Because the features become very broken after cookie-less is enabled, people tend to get confused, and ask questions, or they may use the data not knowing it's very wrong! So it would be really useful to somehow hide these reports from users, or make it otherwise crystal clear that they shouldn't use this data. What do you think?
Note: we'd leave Visitor profile as it's helpful when user id is used
required for https://github.com/matomo-org/matomo/issues/15507
Hiding this data was also suggested in https://github.com/matomo-org/matomo/issues/13655#issuecomment-616892565 but we didn't do it since it can currently not be enforced and is only done client side. There are few more features like Cohorts, Multi Attribution, Visitor Profile, etc. Hiding this features might only be a good idea though if not also the userId feature is used.