One huge problem with Quickbooks Desktop is that it's hugely expensive to integrate it with anything, be it cloud-based software, or another piece of on-premise

One huge problem with Quickbooks Desktop is that it's hugely expensive to integrate it with anything, be it cloud-based software, or another piece of on-premise software. This inevitably results in it becoming an "information silo", and necessitates stuff like dual data entry (i.e. entering the same information twice, first in QB and then in some other software). In contrast, QB Online has a REST API.