It's really cool having a helmet that can slot in different armor set bonuses allowing people some flexibility. We had an entire armor set for solstice in addition to the weapons why not keep the helmet. It kind has that niche feeling that artificer armor had. And can save a lot of vault space being able to cover multiple sets. And has the trade-off that you can't use it with builds that use exotic helmets.
It was so nice that on my hunter I never got a t5 helmet before the end of the event this has allowed my hunter to get that extra little stat boost with my solstice set.
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Something like this has to exist in the future or the games customization will start to crumble. We have both more and less control over what we use than ever before. I can create more diverse and creative builds than ever before. But, often not when I would like to. I would need the gear that I want for that beforehand. Which as my deleted weapons can attest to, the percentage of armor I have is steadily increasing, despite many similar pieces being deleted due to lower odds of me wanted that set and those stats to line up.