What about bands like The Eagles and Lynyrd Skynyrd, and others, who play songs in concert pretty much just like the record?
What about them? That's their choice, which they make for their own reasons. It's not mandated by the gods of musical correctness.
What about Bob Dylan, who has long been notorious for *not* doing that?
Are there any parts to any song that you think have to be there for the song to be "the song", or is it all open to interpretation?
For example, does "Sweet Home Alabama" have to have that little guitar kick off lick, or can that be dispensed with?
Really not much. Generally speaking (I hesitate to deal in absolutes), when you drill down, it's basically just the melody and the lyrics that need to be there to determine the song (and there's even a little latitude there). Imagine a single person with a ukulele, strumming away and singing "You Shook me All Night Long." If you can tell what song she or he is singing, then no matter whether you love or hate the rendition, the song is there. Jazz musicians have always known this. Rock/pop musicians used to know it as well; if they hadn't, we'd never have gotten Hendrix's "All Along The Watchtower," among other good things.
Again, for any of a number of perfectly good reasons, including the practicalities of pleasing a particular audience in a particular working context, you might want to stick with the best-known version. But you're not playing the song itself more correctly by doing so; you're playing one version/arrangement of that song more correctly. Which is cool if that's what you're going for.
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