This module kills Dynamic Page Cache

P.S.: I'm willing to explain more about caching if you need guidance.

I wrote a patch for datalayer module that might be a helpful model - https://www.drupal.org/project/datalayer/issues/3345817 🐛 Pages are uncacheable because of the cache context user Fixed

That's exactly the type of fix I had in mind, thanks @moshe weitzman!

Thanks @kristiaanvandeneynde @moshe weitzman, we're planning to work on this module in the coming weeks, and will update the caching strategy.

Regarding anonymous users, it is perfectly plausible that you want enable this for anonymous users. I can imagine that you would want to enable this during a test phase, where not all testers would have an account. So it is something we need to take into account.

We ran into this on a current LIVE site. We had permission set so only admins would see Markerio. After debugging why our pages were resulting in UNCACHEABLE, we nailed it down to this module. Just wanted to +1 on this being a pretty important issue to resolve.