I’ve been experimenting with tuning down this 2012 Gibson Traditional Southen Jumbo. One half step. So E-major is now an E-major-flat (Eb), and so on. I tried this partly because I have gotten feedback suggesting that my singing often would benefit from a slightly lower pitch. This new tuning basically takes all my arrangements down half a step, which seems to fit my vocal range better.
But the most important difference is in the guitar. It is fascinating that such a small adjustment can have such a big impact in sound and feel. It broadens the range of the guitar, and, most importantly, makes it much more playable. Which is very welcome on a grumpy Southern Jumbo with 0.13 strings, that sometimes have the feel of driving a car with the handbrake up.