Well, I'm not obsessive about it; if I can't get to a charger, I just let it drain. Really, the most practical bounds are 20-80%. It's really easy to make the phone ping a reminder at either end each time to remind you to connect or disconnect, via Automation, MacroDroid, Tasker, etc. Samsungs and Asus laptops also come with a Protect Battery/80% charging limiter already.

If you don't care about the environment and just wanna keep buying and discarding batteries every few years, then that's on you, but I value usage reduction and wanna try to make mine last 5+ years if possible. With that said, I don't think I've seen this video before, so I'll check it out, thanks.