Interested to see from the comments here that a few people still discover Ai's poems, although I think if more young poets read this work, it would have a wide ranging effect.
I remember in the 70s, the thing people commented on was the violence of these poems. The murders. The sexual violence. The blood. But Ai's use of the personae, that she would enter the characters in her poems at such intimate places, received nothing but praise. I think those positions would be completely reversed now. I don't think too many readers would have trouble with the violence anymore. We've seen much more graphic examples in the years since--perhaps an approach to subject matter pioneered by Ai, even though many of the practitioners now don't even know her work, work that liberated them. I think the complete absorption in her characters might cause comment now. People might question her "right" to assume these identities, or think that she used persona so much as a way of disguising her own identity.
Of course, these criticisms, either 45 years ago or yesterday, are all silly. Her movement into persona is a brave jump into other lives. She doesn't feel the need to provide any context, whether the life she's in is famous (Trotsky, Mishima, Monroe, Ira Hayes, etc.) or obscure (Mexican revolutionaries, etc.). I suspect these lives come to her through some study, some reading, maybe a lot or perhaps even one good history.
And the blood? Yes, that is almost certainly a reflection of something in her own character, some need for catharsis. But it also seems right to the situations she has chosen for her poems. It does make them cinematic and memorable.
So if there is any obscurity in the poems, it is in this lack of context. But she has a very good ear for that, I think, knowing what her readers don't know and letting the poem take shape around that. The language is very direct. Almost unadorned. The lines are clean and undemanding. For the most part the poems seem completely self-contained. I wonder what notes or more hand-holding would add to these? It might tie the poems too closely to history, make the readers think they are not enough.