It's not "according to me".
Bruce's live singing WAS inconsistent in the 80s. This is not really debatable or a question of being more or less fans, it's a matter of fact. It's common knowledge in the fanbase that Somewhere on Tour was disastrous, and all it takes to judge Seventh Tour, if you don't want to listen to tons of bootlegs, is to listen to how poorly he sounds on Maiden England. Same for Live After Death.
He simply didn't know how to control his voice, meaning he didn't know to sing, the only possible outcome being - which, guess what?, is precisely what happened - that he used all of it in the first dates and begun to crash more and more miserably as the tour progressed.
He was, and still is, a great frontman, but back in the days also was a technically mediocre singer. Period. And again, he may sound fine to you on LAD, but I wouldn't bet on him having hit half of the correct notes on the whole concert. Most of the times he was just casually screaming the words (and I add, with very poor articulation at times). Again, this is a matter of fact. He just screwed up the notes.
The comparison between LAD and Rock in Rio (post-solo career!) is actually embarrassing for the former. It's like they hired a different singer.
Sorry for hurting your feelings, but lying on something doesn't make it true.