No account managers, no handoffs, no brief passed down a chain until the intent is gone. The person you scope the project with is the person who designs it and writes the code.

Code sits on your repository, content in a CMS you control, domain and hosting in your name. Keep me on because the work is good, not because leaving would be painful.

Every second of load time costs conversions. Performance and accessibility are measured before launch and after, not treated as a nice-to-have once the design is signed off.