Even minimal CD is better than doing (or trying to do) the same thing 'by hand'. And adding automated tests is going to be easier with even the rudest CI/CD setup. Some organizations haven't even taken the first steps towards adopting good software development practices:

1. Version control 2. 'Ticket' system 3. Automated builds 4. Automated deployments 5. Automated tests 6. Code review 7. ...