Eeeh, that's rather selective and doesn't hold up to scrutiny. You mention Deja Vu which has two distinct lines that are repeated over and over. The exact same thing applies to Blood Brothers or The Wicker Man.
Deja Vu chorus is used twice in the song, and it's a fast song, it's over quickly. Blood Brothers chorus and many others are repeated way more often within the song. And Blood Brothers is way slower and much more drawn out. Totally different effect. SSOASS chorus has the same problem, and I indeed think that chorus could have been better. While it is a great song, the chorus prevents it from being 10/10.
I don't deny that Maiden also did this repitition in the 80s too. Alas, much less frequently so.
Brave New World (the title track) goes a step further, flips the lyrics and introduced further variations in the second half. Taking just Senjutsu as an example, most of the tracks have elaborate choruses with few repetitions.
Sure, there are tracks in post reunion Maiden that don't have the problem at all. But the tendency to copy-paste-choruses is much bigger than in the early days.
LIALW is somewhat repetitive, but even that is still more involved than Deja Vu for example.
How so? I don't see that at all.
Hell On Earth, which became an instant classic with the fandom, is commonly criticized for not repeating its beloved chorus more than once.
This only proves that unlike me, most people seem to love these endless repititions. But that's all it says.
By the way, it is not so much the number of times a chorus appears within a song that bothers me, but that those choruses consist of the same line being repeated over and over with ZERO variation. I usually quote No More Lies as the best example for this.
In some cases it hurts the song only a little, in others very much so.
You might dislike Different World, but it has a proper chorus with different vocal lines and a sense of progression, unlike say Deja Vu or SSOASS. I'd argue the repetitive choruses isn't a pre or post reunion thing but a "did Steve write that song or not" thing. He's always, from the get go, had a tendency to repeat simple vocal lines, arguably due to the influence of football chants which tend to be simple and catchy so that everyone can immediately sing along.
Yes, maybe this is a "Steve thing". To be honest, I never paid that much attention to what was written by whom. However, I noticed that this phenomenon appeared more often on albums from VXI onwards. Before that, it was 1-2 songs per album, after that it got more, 3-6 songs per album.
You'll quickly see that the songs with the more elaborate choruses often tend to be co-written by Bruce. And yeah, while there are tracks like Rainmaker that repeat the majority of the lyrics, this is something that's been a Maiden staple since the beginning: Multiple tracks on the first two albums do the same thing, with some songs like Another Life consisting entirely of a single verse repeated thrice.
Well it's not about the lyrics (The Trooper chorus has no proper lyrics at all and still is awesome), but the melodic approach.