As a difference of perspective, two of my acts play down tuned 1/2 step, the rest tune to standard. I tune to the act I am playing with. We tune down not so singers have more range, but so they have more endurance working as often as we do. And, tho I could, and would, transpose if only a few tunes a night were flatted, since all songs are now flatted? I may as well tune down, and keep my positions consistent. We're a variety band with a wide ranging list. Songs already tuned flat; Van Halen, Alice in Chains, Pretty Reckless, stay exactly where they are. Songs performed in standard; Rush, Styx, Kansas, are now flatted. So, Man in a Box and Tom Sawyer are now in the same key, E flat, and performed in identical POSITIONS on my fingerboard as the recordings. I like keeping my open strings and familiar positions available for more technically demanding tunes.
On the other hand, my standard tuned acts perform many of the same tunes. Stevie Wonder's Superstition was recorded in E flat. But we perform it in E standard, thus preserving fingerings and open strings. In the flat bands, this song is played in E flat, but positionally identical to the standard tuned bands.
Going further, most of my gospel and blues playing friends tune flat, but do not tune up to standard to learn standard tunes. They keep their bass guitars in flat tuning, learning all songs without tuning up. So, then, they'd be playing Man in a Box at F position on the E string. That seems a lot of work to me, so I tune for the band I'm playing with that evening.