Graphite If I could guarantee time to charge during the day, I might let it discharge overnight, but I need the safety net and like the convenience.
These are the tradeoffs and decisions only we as owners can properly decide, for our phones to be useful personal tools that hopefully last until the security updates stop.
It might be ideal to not linger at 100% for too long to avoid peak voltage. Which is why I use only a 1A charger overnight, it's only at 100% for a couple of hours.
This is a good approach, and the 1A charger will not cause battery heating. I stopped using my new PD charger (not Google's) which I bought with the phone because it clearly charges too quickly so heats the battery. Like you, back to the old, small charger, unless something happens and I really need to charge the battery in a hurry.
Earlier in this topic I referred to chargie.org's battery charging control product and related info on battery charging and longevity.
Since then my chargie has arrived and I've had a few days to test it on my P7 with GrapheneOS.
It works well on Graphene, as I expected it to. It doesn't need any more privilege than to access the battery voltage, and bluetooth which is used to communicate with the dongle.
It allows me to set high and low % charge level, which it does maintain. It does so by electrically sitting between the charger and phone, where it can actively measure and control the power going from the charger to the phone, working with an app which communicates with the software drivers which read the battery voltage and temperature.
It has some other neat features too, one which is to regulate the power going to something like a dumb external lithium power pack so it does not overcharge. Anyway, the product website is clear and informative so check that out if you want to learn more.