My workaround (not a good one but all I could think of) is to not track time in a separate piece of software and add in all the hours on a single day when creating the invoice for each customer.  This means that on the last day of the month it appear that maybe 40+ hours were worked by one person on one job, an then that same person worked 40+ hours that same day on a different job, but at least the services get aggregated for a clean invoice vs every distinct 30 minute (or whatever) task being listed individually.

I understand this is awkward and so much more prone to errors and harder to audit.  It is just the best I could come up with if this feature is not restored by QBO.  Interested in any other workarounds people have generated.