Yeah, NOTD live album sounds like a bootleg to me and (even worse) Mexican performances and Rio 2019 were their worst on the whole tour! I think Rod and musicians have no idea what to do next. They've planned 2020 tour and release of 17th album later those year but - as we all know, COVID was faster. Steve Harris is a great bass player and composer but definietly not the best producer in the world. When Martin Birch has left the board soundwise of the band has never ever be the same and IM was never be so magical (too me, of course). I suspect if the band sales would be down they just decide to split up and doing their own things as we see. IM is just an additional activity for them, I think they don't treat this band so serious anymore. Sad but True.
P.S: Comparition between heavy metal band and the Prince, Bieber or something from pop scene as being "much, much bigger" is not correct. Different music, style, fans, aesthetics, etc. Metal is generaly a niche phenomenon, especially traditional heavy metal. The only metal - oriented band we may compare to pop mega stars in terms of popularity is Metallica. But, as we know, they can offer varied programm with radio-friendly rock hits and unbelieveably popular ballads which attracted them much wider audiences around the world. It's a different story...