Genres are so weird nowadays. So many bands get categorized in ways they shouldnt be. So many bands can be categorized in a ton of different genres but get pigeonholed. Hammerfall has certainly done stuff that is classic power metal, but a LOT of their stuff is very much traditional metal in the style of Maiden. Iced Earth I do not think is power metal but always get put in that category. Same with Nevermore (RIP). Helloween does power metal and are known as the originators of it, but if you look through their discography there is a lot different style: traditional metal, progressive, Nu-metal, glam, and so on.
A lot of these bands have songs that could be radio hits but won't because of this. Done ranting.