Just an example: when I send an email marketing campaign with Odoo, I have all the stats attached: the usual # clicks, open rate, ... but also # Leads, # Orders, Revenues.

Because Odoo as it all:

- You send an email with link tracker (Email Marketing App)

- The visitor goes on website (Website App)

- He fills a form that creates an opportunity (CRM App)

- 4 weeks later a sales make a quotation (Sales App)

- After Delivery (Inventory App)

- We send the invoice to the customer that books revenue (Accounting App)

So, you get the revenue for every email sent. Imagine that power for everything. (eg. stock is common between eCommerce, CRM, POS - Wommunication on whatsapp, SMS, chat, emails are centralized for helpdesk, ...)

But the main advantage is convenience. Once you use Odoo, everytime you have a need, you can install an app in one click that fully integrates with your stack. No need for developers to integrate, to call vendor to buy software, ...

The complexity of an IT stack grows with the square of the number of software components it contains. Most Odoo clients run everything on Odoo, eliminating the need for integrations and significantly reducing overall complexity.

Odoo SA (my company) has 6700 employees: we only use 2 software to run everything: Odoo and Google Workplace.