And I'm not a fan of text bleeding into images, as you need vignetting or darkening to make it always readable. But yes, personal preference I guess.
Yeah you do on light images. It depends on how users browse. Do they go into a category first and devour everything there? (maybe they dont care to see the text so much). Or do they click hashtag to hashtag and spend a bit of time in each (then it probably matters more). I think it could go either way.
As a photographer I despise any edit of the original image, no matter how slight.