One thing I feel Maiden haven't been doing as much as in the far past is those signature, proper twin-lead harmonized guitar lines...I think this has been the case since the Fear of the Dark album, really...lots of times, yes, you have the two guitars doing the melody, but it's a single note (or maybe just a different octave).
I'm probably just rambling
but I'm thinking those absolute classic moments, like the ending of Seventh Son (the song), at around 8:55 (probably one of my favorite moments in all of metal music history!) or Infinite Dreams (around the 4-minute mark, and then again after the 5-minute mark) or in a number of Powerslave songs or, well, a ton of old Maiden songs period...
Listening to BNW, for example, there are moments that just scream proper twin-leads...not to say they should over-use that trick, but in some cases it just brings it to the next level (even just thinking about reunion albums, the section after the solo in Rainmaker on DoD...predictable, maybe, but so, so good). And it is all the more puzzling to me, now that they have 3 guitars and they could a bunch of cool things (and reproduce them live!)
Anyone sharing this feeling or am I not making any sense?