My son is really drawn to this style of music and as such, I listen to it quite a bit and he and I play together doing a lot of this kind of thing. It is not my "thing" but I have a lot of respect for the guys that can do it. Derek Roddy does just fine with playing in bands by the way.
All of the speed metal, metal core, whatever you want to call it is just the logical (or maybe not so logical) extension of what earlier progressive bands were doing. My son listens to a ton of Dream Theater stuff and I find it interesting to hear the occasional Rush chord progression, the Return to Forever melodic riff, the Kansas melody, etc. A lot of their stuff is really quite interesting and very challenging. The speed metal bands do generally play at one dynamic level which wears me out. I have often joked to my son that a metal band was sitting around watching TV one day and "Space Balls" came on. At some point, Rick Moranis as the Darth Vader-like character ordered his crew to "LUDICROUS SPEED" and all of a sudden light bulbs went off over the heads of the musicians. The band members looked at each other and said "we could totally do that!" And now we have speed metal and blast beats. It is really where sport and music collide.
As I said, it is not really my thing, but it would be really boring if there was only one kind of music out there. On top of that, interest in this kind of music just breeds chops for days. My son, who has only been playing for about 18 months does some mind blowing things with his feet. Jumping between 16th notes and 16th note triplets at ridiculous tempos, just all kinds of things that I would have never even imagined (or anyone else for that matter) when I was his age. I make him work on more groove oriented stuff and he struggles with it, but it will come with time. Appreciate this stuff for what it is and then move on. I will say that trying to play this stuff for an old man that does not play double bass is extremely challenging and may eventually lead to a heart attack. Mind Blowi But it is really cool to play together father and son.
One other thing: there is a really interesting video series on YouTube about Dream Theater's audition sessions for new drummers to replace Mike Portnoy. Regardless of whether or not you like DT or this style of music in general, it is a very interesting and inside look at what auditions at that level look like. Guys like Derek Roddy, Mike Mangini, Virgil Donati and Thomas Lang fly in from all over the world and go through a pretty detailed audition process. You might be surprised.