I can understand that but then again you're not trying to run a resource that caters based on its inclusivity of all sorts of HM into a master list (which is the issue this thread is dealing with). For such an endeavor, one needs a working definition of what HM is and for my money, it cannot rest solely on the examination of
sound.
Simple example: based solely on sound, HM and Metalcore are made from the same identifiers: riffs, heavy guitar distortion, often extreme vocals, punishing battery. Yet HM is accepted in the archives, but metalcore supposedly not (though there are hundreds of metalcore bands that have slipped through). Why isn't it accepted generally? And why have some slipped through? It's not accepted because HM fans (or to be more exact, M-A moderators) currently believe
metalcore is bad and if something is branded as overtly metalcore, it's not accepted in the archives. It doesn't have to do with what it is, it has to do with what people call it. And the bands that slip through? Some moderator listened to that metalcore band and decided on that day, in his given mood, that the band was sufficiently "metal sounding". Meaning: enough riffs and double-bass.
Contra-example: NWOBHM stalwarts Praying Mantis are not included in the archives for not being "metal sounding" enough. Meaning: not enough distortion and double-bass for the moderators of Metal Archives.
Clearly though for anyone with an active interest in the band, Praying Mantis should be in any serious list of HM. Why? Because they
ARE HM, regardless of whether they seem to sound it for 00's trained metal ears. How can we tell?
Let the skies darken
So I can see the light
Let the clouds open
To drown my scent of fright
The sounds now all around me
Echo madly in my mind
My life may soon be over
In this game against mankind
Now the moderators at M-A don't have time to look up lyrics, look at covers, read interviews with a band and listen intentfully to a full record to make the call, but ... that's what it should take before someone decrees something to be HM or not. Not just to say if it is 'metal sounding', but if it is HEAVY METAL. As it is M-A is a list of 'metal sounding' bands, with a heavy bias against most modern 'metal sounding' bands, but that doesn't help much. I say however that they shouldn't be less inclusive, I say they should be MORE inclusive, put everything that is variably connected to HM in there and let the listener-researcher decide if it's HM for them. Just as long as the info in there is factual.