Semi hollow was my first bass, which I would carry around with me and play at any opportunity -- including jamming with acoustic guitarists, unamplified. I definitely had to use a pick to be at all audible. No ABG's back then, woulda been nice.I have a 30" scale semi hollow bass. It's loud enough to play unplugged at home by yourself and it sounds great plugged in. No feedback even with tube overdrive.
Gotta say, though: now I do have an ABG, and it doesn't seem much louder. Probably because I favor fingers these days. And finally trained myself out of playing it as hard as I could, just to be heard, which wasn't ideal for either control or tone.