Luckily, they don't have to do so. My best songs are written with getting laid in mind. Sometimes it sucks but mostly it is quite enjoyable. I can't speak to whether or not it's worthwhile or useful, exactly. It's just part of what rock bands do.
Samples are a fad.
Anytime a new electronic fad pops up, people fall all over each other to be the first to champion the death of the guitar. In ten years, no one will be listening to much of the electropoo being produced nowadays. I'm somewhat out of it. I bought an Ed Kuepper record the other day because I heard a song on the radio. The rest of the record is o.k., but that song really has it.