I appreciate you for voicing out your feedback, @FR2X-MP.

The questions and answers here on the Community page can be viewed and read by any members. Moreso, any member can mark a response as an Accepted Solution if it works for them. 

Meanwhile, you can set QuickBooks not to mark all expenses as billable. 

However, when you create a bill from the purchase you've created, it will still automatically check your billable column once you choose a Customer:Job on the drop-down arrow. If you want to assign a specific expense to a Customer:Job, you can remove the checkmark on the bill itself.

For more insights, you can read through this article: Tracking job costs in QuickBooks Desktop.

Feel free to leave your comments below if you have other questions. I'm always here to help.