New Imperial Knights player looking for insight on Helverins vs. Warglaives

Hey, new IK player here! I’m absolutely loving them, discovering them has made the game feel brand new to me.

I've been running four Helverins and getting great results, but I’ve noticed that many players opt for a mix of two Helverins and two Warglaives instead. I’m struggling to understand why.

I get that Warglaives bring melee capability, which could make them useful for holding objectives, but I worry that they won’t survive being charged by most units. Am I missing something? I’d love to hear more about the strategic advantages of Warglaives and when they’re worth taking over additional Helverins.

Thanks in advance for any insight!