There are few absolutes in speaking.
With the right speaker in the right situation - almost anything approach can work.
Watch the beginning of this remarkable speech by John Wooden, (1910-2010), the beloved basketball coach who was the only person to be inducted in the Basketball Hall of Fame - both as a player and as a coach:
From the Green Room: It is almost always a bad idea to begin a speech with an apology - especially one in which you don't assume responsibility! But clearly, in this case, his apology is a brilliant and endearing way to open his remarks.
The same holds true with any of the basic rules of speaking. In the right time and place - and with the right speaker - any rule can be broken, once in a while. Never say never.