Battery health dropped from 100 to 95

You are welcome

Those articles are either very old or not from Apple.

iPhones will learn your sleep pattern, charge to 80%, then stop til nearer your wake up time and finish up to full 100% ready for breakfast.

That is why fir most people, charge while you sleep is best

It happens.

Charge it when not in use.

95% at 7 months old is better than expected.

Expect 80% by 20-24 months

By the way nobody at Apple says not to overcharge. You cannot overcharge it. The control circuitry is very smart. Leave it on charge all night.