I agree that weak angles happened in every era, but I do think they're more common now. Unoriginal angles are definitely a bigger problem now than they were back then. Things get rehashed.
I'm talking about everything being scripted and rehearsed these days to the point of sounding too polished and fake. It's not raw enough now.
Back in the day dudes were cutting promos on the fly, they were just given a few talking points for an angle and they ran with it. They had to really get into their roles and understand their characters to do it right. It gave everything a sense of realism that you rarely see now, because the dude cutting the promo is gonna understand that character better than any writer.
Randy Savage ... imagine if he had writers scripting his promos? It would have sucked, because that dude just submerged himself into what he was saying and basically became that character. He understood it. He was completely intense and hiliarious at the same time, and he seemed to be genuinely out of his mind. The way things are done now, nobody is ever gonna touch that. Jake Roberts is another one who would have suffered if his promos were written by someone else. Hogan too.
I think you're confusing the 80s with the attitude era...the attitude era was more of an off-the-cuff, from the seat of your pants era of promos and angles that you're referencing. 80s was a pretty tightly controlled product, where wrestlers had to work within a narrow, cartoonish, framework.