Model the work, not the “workers”. With team member magnets, checklists, and markers...the bottom design can more than adequately model the work
If work ever “moves left” (e.g. QA/demo passes an item “back to dev”), then the top dsgn breaks. It is all doing.
If QA truly doesn’t start upstream (please let them :)), and there is a hard handoff to test, you might want to considering something like this.
At least this is calling the kettle black. My guess, though, is that testing is “working” on the items earlier