Ofc the cloud offering has much more, but you have to consider that no other major ERP software comes with the engine 100% opensource, in the kind of market. So yes, you may feel Odoo community a bit incomplete and probably don't want to pay the cloud version. But the alternatives are SAP, Microsoft, Oracle, some very fragmented open ecosystem, or some 90's GUI custom ERPs, right?
I can tell you we use Werkzeug and not Flask, have reverse proxy nginx, use postgresql, and I don't see a lot of tech debt in that.
Not much AI, all the reviews are manual and kinda strict.
