1 & 2 is expected to be improved through a future firmware update.
3.Please tell us what kind of card, app, or payment you're trying to use with NFC. Is NFC detection normal? Please try testing NFC in SMMI test (Type .12345+= in calculator). Please also check your inbox for a PM I sent you.
5.Sorry for the inconvenience caused. We'll look into this problem and keep you updated.
7.Please test the charging speed without using the phone, clear the background apps, and turn on airplane mode. Please test for a longer term and provide us the battery variation screenshot. (Settings>Battery on the battery icon to access Battery usage, and take a screenshot of this page.)
9.Do you mean it should flash green&yellow when notifications come to Discord in Android 10?