The guitar's low end is no less valid than that of the bass, kick, or keys. The notion that it is not is the myth that needs to die. The guitar is no different in that its low end must be balanced. Balanced and eliminated are two entirely different things. Low shelves and peaking filters are your friends. IMO, the "cut everything below xxx Hz with a HPF" mantra is the hallmark of a lazy/ignorant engineer and the pathway to anemic guitar tone. HPFs have their place; but all too often they are used as a blunt instrument, and as standard procedure rather than a carefully considered option. I've known FOH guys who put a 250 Hz HPF on the guitar before soundcheck even begins....before they've even heard the guitar.
The sub end of a guitar is relatively minimal for many great tones, but still essential. When properly balanced, it in no way interferes with the bass or kick. It is swamped by them. Taking a reasonable HPF in and out won't even be noticeable when everything is going. But when the guitar is exposed, that low energy can make all the difference. And that non-zero amount of low energy, for me, is what chug is all about.