Can I post one of the many scenes that isn't a Nen explanation? :p
There's definitely something to be said about the overuse of internal monologues and ability descriptions, but given the nature of this arc and what Togashi wants to do, it's all but inevitable. Also inevitable, given his health, is more "tell" than "show" unfortunately.
And weren't some manga readers also saying that about the CA narrator? Though I recognize many still completely despise him, even though some have tried to explain his necessity.
https://www.youtube.com/watch?v=moSQa_obcNc
https://www.youtube.com/watch?v=l9DU6U8BJKU
If anything, I think the biggest issue will be the number of characters and people trying to remember names, relationships, etc. (a problem for many manga readers as well). In this regard, I'm most worried that Togashi is spreading himself too thin with the number of characters, which is why I hope he's done introducing any more!