Interesting points made for and against. I've always used the lightest strings I can get away with - I tried 8's a few years ago, but although I enjoyed the FEEL of them - and the playability - I'm just too heavy handed. I could not, for the life of me, make those top E's last more than a couple of days....bend, bend, SNAP!
For me, it's a trade off between playability and tone - the heavier the strings, the fuller the tone, but harder to fret....no point at all having the fullest tone in the world if you can't hold the strings down on the fretboard! I've had 10's on my acoustic for a few months now, I thought I'd give them a fair try - yes, I've got a slightly fuller sound, but it's harder to play barre chords, especially F, Bb, Bm...my reduced hand strength makes it difficult to hold barres down for any length of time.
So, next time I change strings, I'm going back to 9's - D'Addario 9's. Never been a big fan of EB's, they don't seem to last 5 minutes, whereas with the D'Addarios I'll get about 3 months out of a set. The slightly thinner tone of 9's, as opposed to 10's, will be more than offset by the increased playability and ease of fretting.
I'll only use 10's again if I can afford another acoutic guitar which I can keep in open G - the slightly reduced string tension across the board offsets the heavier gauge strings.
One last point - I've never had a problem playing slide with 9's, either on acoustic or electric - that's all about touch and feeling. Takes a while to develop that light(er) touch, but once you've got there, it's like any other style of playing guitar - muscle memory kicks in and you're almost playing on autopilot.
String gauge, at the end of the day, are like single coils versus humbuckers, or Gibson versus Fender - it's down to what the individual guitarist likes, and it'd be a borin' old world if we were all the same!
"Sometimes the beauty of music can help us all find strength to deal with all the curves life can throw us." (D. Hodge.)