The Sales Order saga with QBO has been going on for 2+ years. Suggesting using Estimates may work for a very limited set of cases but doesn't for most of us. Few reasons why:

- how do you distinguish Sales orders from Estimates now?

- Estimates don't affect your inventory while Sales orders should

It's quite ironic that we, the users, need to convince the development team to introduce a feature that exists in the desktop version.  All we're asking is "do the same in QBO".