So long as they are silent/quiet (non-disruptive) and not blocking tradfic, should be a non-issue. My empathy ends, regardless of if this is in a lounge or not, when feet are washed in drinking fountains. Also, when sinks are used and the bathroom floor is left with obvious puddles and zero attempt us made to wipe them up.

Would all the other respondents declaring non-issue have the same response if instead of someone praying it was someone using the same space to post up, lie down, and take a nap on the floor?