Labelling and archiving

Should I label AND archive a chat?

Yes, labelling adds a chat to a label inbox (it stays in the Inbox too), it does not archive it.

You can label AND set a reminder or archive a message to mark it as done.

When the reminder is due or you get a new reply, the chat will return to the label inbox.

Why would I want to do this?

Kondo is best used with an Inbox Zero workflow; and this applies to label inboxes too. Read more about Inbox Zero here.

What if I want to see all the chats I labelled?

You can use the filter 'all including archived' in a label inbox. This will reveal everything you have archived and set reminders on in that label.