Some presentation slides live for years, and that might be the reason that we are hesitant to change them, we think: well, the audience will expect this slide.
If nothing about your story has changed, then this is a valid point. If not, it is the wrong approach. The same slide signals no change at all, business as usual. Also, even if you did change its content, the audience will think it is the same slide as last year, and will not notice the different content.
Sometimes, change is good.