Don’t let your client become your creative director

You’d hear them say: “No, use red instead. That circle is too small. Make it a little bigger…”
As a designer this is bad fro business. Your client would definitely pay you less because they’ve had too much say in the design process.
Also, they don’t trust your design capabilities. They’d waste a chunk of your time with endless revisions. Eventually, they’d lead you into a ditch, and you’d be embarrassed by the outcome, so much you wouldn’t want to include it in your portfolio.
PS. Allow designers room to do their work.