Hi. On the one hand, you are trying to make the interface simpler for less sophisticated users. but on the other hand, you discontinued QBD and are pushing people to QBO. Adding a Customer # field as in QBD is most definitely not confusing for anyone. In my tech environment, this is the way that we link customers between systems. 

Dumb, dumb, dumb, intuit. You're basically asking people to investigate other platforms vs. just adding the field.