Even the original Cloud had trouble browning the load at lower temps. I think the EVo is going even further. After a milky hit on max the ELB contents are still light/green but you can taste the 100% high-temp toasty vapor.
I think this is another consequence of EVO's heat precision - its very narrow spectrum of spatial and temporal heat range. The upper end of the spectrum is what makes the middle of the load go brown.
The are no upper ends (no place in the bowl at no time) that make your load go brower than it should on your set temp (as in every other vape, even sligthly the OG Cloud).
There are no bottom ends giving you better flavor than it should on your set temp (that's why the EVO can change the taste drastically after turning up the temp slightly).
The EVO just gives you a continuous stream of air heated almost exactly the same in its whole volume for the whole time.
In othes vapes, where the spectrum is wider, the part of the bowl that gets hit with the upper end get browned and the sides remain green and mix in some good taste.
In the EVO, the is no borwing from the upper end and also no green left on the sides from the lower end. When you continue to hit it, you will notice the whole bowl goes brown at once at some point with no green left.
If you want browning, you need to hit it few more times even if it doesn't output any more vapor.
The EVO just extracts so well that it's possible for herbs to not brown YET when they are nearing 100% extraction.
When I used Volcano, I noticed it also starts browning only at high temps when I keep blowing more bags, even if there is not any more vapor it can pump out.
That's the same thing - the volcano can be very precise because of its massive heat exchanger and steady airflow. The EVO achieves this with direct draw and to even more extent.
vvvvvvv Yes, that was the point.