I'll restate for those in the back that can't read... 4k60 and dual card slots. Oh wait and ibis. Man o man.
I guess I'm really out of the loop! I don't think I can name one camera in a comparable price range and sensor size which has 2 card slots, IBIS, and 4K 60 which was on the market as of August 2015, if we're indeed saying that is 4 year old tech.
Let's look at some comparable cameras that had been released by August 2015, 4 years ago. I think the closest comparable cameras for this price point would likely be the Sony a6000, Sony a68, the Fujifilm XT1, Fujifilm XT10, Nikon D7200, and I'm sure others exist too. None have 4K, one has 2 card slots, one had IBIS. I don't think these features are 4 years old, as you suggest.
In fact, I'm struggling to identify a camera on the market right now with
all of those features in a comparable price range. Let's look at the closest comparable cameras on the market now. XT3 has 2 card slots and 4K 60, but no IBIS, and I'd argue that it is positioned at a higher tier than the 90D or M6. What about the XH1 - it has IBIS and 2 card slots but no 4K60, but again, it's priced even higher than the XT3 so not really comparable. What about the XT30, much more comparable price - no 4K 60, no IBIS, single card slot. How about Sony's offerings - a6400 has no 4k60, no dual card slots, no IBIS. Maybe the a6500 - no 4k60, no dual card slots, but yes IBIS. What about Nikon - the D500 is a tier above in my opinion, but let's look anyway - no IBIS, no 4k60, yes dual card slots. D7500 isn't much better, no 4k60, no 2 card slots (removed from its predecessor no less!), no IBIS.
So I guess I must be really missing something because I'm struggling to find a comparable camera that has all these features. What APS-C sensor camera has 4k60, 2 card slots, IBIS, and is priced at least comparably to the 80D on release, and was at least announced by 4 years ago - August 2015? Are there any on the market now? I'm asking honestly, because I can't think of any.