This is something I do on my new (Samsung) phones for the last 2 phones and this latest one I also turned off fast charging. On previous phones it was capped at 85%, current ones seem to have several options with the highest "saving" being to charge to 80%
If I'm going out for the day and need the full charge I turn it off for the duration and if I need a fast charge I turn that back on.
By and large though most of the time I keep it off. Seems to make the batteries last a bit longer. Too early to tell on the current phone though. Only a year old. I generally keep phones for around 4 years.
I used to do the opposite on the old nicad batteries phones had in the 90s. I'd carry a spare fully charged one, run the main one down to zero, swap them and then charge it to full. This made a huuuuge difference though.
I do this with my OnePlus device running lineage OS. There's a toggle to only charge to 80% and I've turned it on and always use it and then I only let it drop to about 30% before I plug it back in and this keeps it from getting too high or too low. I think getting too high damages the cells more than getting too low does, but by capping the bottom side at 30%, I guarantee that I will find an outlet to plug it in before I run out of juice entirely.
Not seeing that option in my pixel 7 with the latest December update (which revamped the settings menu with a different order, placing Google at top instead of bottom)
That's not what bypass power is. A phone can draw just the amount of power it uses at a time and still have it go in and out of the battery before being used