What he's referring to is the way you clearly started this thread to get some positive reinforcement and shoot down criticism.
Also,
that post is silly, using dragonforce as a yardstick for power metal is bizarre, and "generic" means they sound very average and typical, which they do.
As for the above post, I think "trendy reasons" means they do it because it's a trend (for reasons of trendiness, if you will- possibly some relation to the singing style, which mimics modern trends? I dunno), and "blindly" may imply a lack of... sight, maybe? Metaphorical sight, even? Artistic vision? It's pretty complex shit. Better form your own conclusions!