the efficiency is relative; you would have a pile of defects to deal with when the dev team comes back. also it's not equitable. as qa, I've experienced this.

the efficiency is relative; you would have a pile of defects to deal with when the dev team comes back. also it's not equitable. as qa, I've experienced this. those bugs just get thrown in the backlog and the technical debt grows until it's crunch time and we're blamed we're not finding bugs fast enough, despite being available more on the project than the team which had a week off.