I've learned that lot of slide players use open G. Most players have dedicated guitars for playing slide and/or alternate tunings, which I don't. I learned to play guitar and started with a slide in standard EADGBE tuning long before I realized I could use alternate tunings. I'm from a small town in the Adirondacks from the days before computers and cable TV. There wasn't a lot of info available when I was growing up learning to play. Back then it wasn't nice for a young blonde haired blue eyed white boy to play boogie woogie on the piano or blues on a guitar so you were careful what you asked about. You learned by mimmicking what you heard when you could hear it. Playing slide in standard tuning is supposedly more difficult or so I'm told, and I doubt I'll ever really master playing slide. Or guitar.

Hope that makes sense?