In my experience "Native Speakers" often don't understand each other correctly (of course random ones, from different parts of world) - plenty of tiny misunderstandings due to the tempo of conversation. 5 random non-native speakers may have all bad accents but they speak freely. When a native speaker joins the room the other 5 suddenly say they can't keep up and native speaker doesn't know how to fix that. I'm not even generalizing - seen it in practice many times.
I find it very true in daily technical conversations with other companies, conferences and on any type of trainings (online courses as well). Non native speakers tend to get to the point more easily. It's easier for themselves. Then don't try to dazzle you with funny wordplay and jokes that make no sense outside of speakers country. It takes a lot of skill for a native speaker to be pleasant for foreigners.
To your point on vocab choice: if I use vocab not present/with different meaning in American English I would get blank stares so I often switch to the American term e.g. mobile phone vs cell phone. To your other point about local slang: I recently learned South Africans call traffic lights "robots", which I thought was fantastic.
The worst part is that uBlock Origin's element picker doesn't work on Firefox for Android (or if it does, I haven't figured out how to use it), so on the one platform where it's maximally annoying I can't do anything to block it.
A previous request clued me into “Freedom of the Hills” and “The Mariner’s Weather Handbook”
“ The most complete guide to marine weather analysis, tactics, and storm avoidance. Teaches traditional forecasting based on current observed conditions, as well as the latest tools including facsimile charts and the Internet. An easy-to-use tool for sailors, power boaters, professional seamen, and anyone interested in the weather.”
Sometimes starting on tasks that require my brain to work with me can be enough momentum to push start it into whatever it is that I need to complete. But a lot of the time it is exactly as you describe; no matter how long I work at it it's extremely hard to get through or even impossible. If my brain doesn't want to retain information or process information to create something, it won't.
There are strategies and things that can help with this, but a lot of them require external resources and understanding. Having well defined tasks with good external accountability can be really helpful. Having strong incentives for completing tasks can help too. The problem is that finding people that can accommodate your needs here is pretty damn hard.