Same here...except I tell up front when they apply that it's more of a formality for HR. I respect their time and don't want them to waste time preparing or getting nervous. I tell them it's mostly for the team to get to know them and for them to evaluate the team and we'll keep the interview light.

I still give my team the option to decline them if there's major red flags - but I have not had that happen.

Also, a reminder...an interview it is a 2 way street. Your 1 question interview doesn't give the candidate an opportunity to interview you or your team and the "Welcome to the team" is a little presumptuous...I assume it was left out for dramatic effect and I'm sure (I hope?) you allowed the interviewee time to ask questions.