It’s very hard to write a review of “A Strange Loop,” a many-laureled musical that first ran off-Broadway in 2019. It lives in, even wallows in, its meta elements, occasionally passing judgment within the text of the show on its own efforts to sketch out conflicting characters and stories. So if it’s already looking at itself and self-criticizing, who am I to pile on? (Not to mention that I am supposed to avoid using “I” while writing this.) As …