Before I started teaching guitar there would be only one tuned to standard, one tuned to open G, and the others tuned a semi-tone down. My vocal range is low so I like to tune down. I might have been conditioned to a lower tuning anway because the family piano when I was growing up was tuned a semi-tone low. But, to my ears, many guitars sound better tuned lower.
These days most of my guitars are tuned to standard, except one or two in open G, DADGAD, or something related. The exception is the 27" scale baritone which is always at least two semi-tones lower (with medium strings) or three semi-tones lower (with heavy strings), and is often in some other strange tuning.
As for capos, I don't like spring types because they often clamp too tight. The adjustability of Shubb, Planet Waves NS, Victor, etc work better for me, though I have a couple of Kysers cut down for "virtual tunings". Planet Waves has a new spring/adjustable one ready for market (though I've had trouble getting one) which is supposed to let you set it then easily spring it on and off.
The trouble with tuning down is getting the rest of the world to do it, LOL! I always end up tuning up to it.
Peace, Mooh.