I just listened to all of them and thanks to my fine tuned professional ear, here is my conclusion. These bands never made it because they were horrible.
There is such a fine line between great band that didn't make it and band that's obscure cos they are shite lol. Your list is a bit of both. Its all subjective though hey ?
Put certain things into actual context, and it’s easy to see why they didn’t make it.The ‘78 release of the P250(or whatever) band, for example. Van Halen’s debut came out the same year, for cripes sake!Talking about Survivor’s 1979 guitar harmonies being seen in Thin Lizzy music. Well heck, Thin Lizzy was already doing it... WAY better and with WAY better songs! Actually by that time, Iron Maiden and Judas Priest we’re ahead of that game.There are no surprises on any of these as to why they didn’t make it.