" It only creates problems" I do not think thats correct. The problem has arisen with the infusion into armour and the masterworking of armour. However, to answer the point - essentially enhancement cores are the equivalent of the motes of light (for infusion purposes). D1 had an abundant of sources for motes of light - in fact I cannot ever recall not having any. One of things that D2 needs to do is providing levelling up sources for enhancement cores. Levelled up a vendor - take 1 core. Ranked up in Strikes ( if this was a thing) - 5 cores Ranked up in Gambit - 5 Cores Ranked up in Crucible - 10 Cores Break down and exotic - 5 cores ( why this only give three/five shards + weapon parts is beyond me) Then similar to D1, D2 require something similar to exotic shards. That it used to masterwork only. The infusion system is not working and its because the system is confused with which way it should be operating. Its an easy fix in my mind

Because we don't have those sources like you listed, it does create problems, lack of is just one major one. If I recall, motes of light had a similar role if not same as cores did for infusion, only, why wasn't there any complaints about them? You got them via filling out that exp bar, 5 of them, completing public events, faction packages, dismantling rare(sometimes) or legendary gear, and completing vanguard and crucible bounties, main thing is, you can earn them just by playing the game where as cores, you need to do very specific things to get even 1, 3 of those in spiders bounties aren't even worthwhile, wait and stand around how long for a wanted enemy show up only to get 1? When I can do 3 wanted lost sector bosses and get 3 in the time it takes just to do 1 wanted HVT, if not less. Had we have cores drop like motes did infusion wouldn't be a problem, there wouldn't be players strong arming the infusion costs, and actually use cores as they were intended. Infusion and masterworking. The only reason why I carry a bunch is to mitigate, more accurately, bypass the painpoint of infusion. The infusion system would be working if the sources for getting cores were akin to Motes of Light. Here's something they can do to fix the cores issue, one of which is already present in game. 5 per every obtained certain amount of EXP(Every bright engram basically) 1 from public events 1 from faction packages 1 from dismantling rare(sometimes, you can make them painfully rare here if you wanted, cause they're blues) and legendaries(Somewhat rare, but 50/50 on if you would get one or not). 1 from vanguard and crucible bounties. 5 per crucible and infamy sub level 10 for every reset on crucible or infamy I'm not saying they should have to make it like that set in stone but that would be an actual fix on a confused currency in the games economy. It's an exaggeration when I say this but that would be what many would call, a fix done over night. You wouldn't need to be doing specific things to get one, you would get them just as you did with motes, by playing the game, literally. Getting 7 from the clan milestone is a start, I'll give them that, but there needs to be more.