No they're not. I started a brand new character on PC, and I have plenty of Cores already to infuse with, but dont yet have armor with perks on them worth infusing.
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Same dude. Started 5 weeks ago and I’ve masterworked 10-11 weapons, a whole set of armour and brought a fair amount of weapons and armour up to max light level so I can switch when I like. Cores are everywhere. With nearly 3 months left until the next expansion... I’m going to have literally hundreds of spare cores