I spent an entire afternoon recently using the pole saw to cut up some limbs from another type of oak tree with no sign of the chain dulling. I think you're right, you're going to need to seek out a professional-grade chain in the correct size.
Alternate Solution: In order to get a more durable chain, you're going to have to go up in size, mainly width. The next larger sizes are 0.050" and 0.063" (this might be a bit too large). By going with a wider chain, you'll have more metal on the cutter tooth, but of course you're going to be using more battery power to drive the system.
Warranty: Changing out the Ego bar/chain combo will of course void your warranty.
Technical Discussion: The Echo 58V, Ego 56V and Kobalt 80V all use the same "A041" motor mount for the bar; so you could theoretically bolt on any bar/chain combo, as long as the drive sprocket will work.
Ego Team: Please have you Engineering team evaluate whether using a 0.050" width chain on the existing Ego chainsaw drive sprocket is possible. If so, that would allow Ego to offer an alternate (wider) chain/saw and bar combination.
This thing eats trees for a living, and this guy has been running machines like this for a very long time. If you look closely you can see the drum is covered in large hardened steel teeth that are replaceable. In this picture he is replacing about a half dozen of them.
He told me that certain tree species are much harder on those teeth than others. Surprisingly Cedar is one of the worst and just happens to be what our lot was covered in.
Knowing that I am a little more tolerant of the fact that I dulled my Ego chainsaw chain in about one days worth of cutting.
Those of you who have lots of experience cutting with other chainsaws will know much better than I... I’m just stating this for those who may not have much experience and who are following along with the conversation.