I have a always wondered why so many yankees tune down to Eb and in relation to Slash alternating probably has more to do with needing some open root notes that might otherwise have required a capo.
Lots of stuff out there advocating why Eb on 24.75" scale with 10-42's sounds best. Definitely easier to bend notes when tuned a half step down, plus also a slightly deeper tone, but not as dark as drop D.

Sent from my SM-A520F using Tapatalk