I fail to see why it's an issue.
If you hit 700 and infuse your favorite set that costs you 16 cores for 5 armor pieces and 3 weapons, a full loadout.
It costs 17 to masterwork a single weapon.
If anything the complaints should be about masterwork costs - not infusion.
Unless you are spamming infusion on your favorite armor set every +3 light you get this isnt an issue - and if you are spamming you need to learn to manage resources
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Exactly because you lose 10 cores when you dismantle