"whats wrong with Mali" Needing proprietary software it what's wrong. :)
To quote from https://libreplanet.org/wiki/Group:Hardware/ReverseEngineering#Mali: "Mali GPUs are divided into three versions: Utgard, Midgard, and Bifrost. The Lima project is creating a free software driver for the Utgard series. Conversely, the Panfrost project is freeing Midgard and Bifrost. However, neither is ready for daily use at the moment. You can help!"
So Mali is not usable in freedom. The upcoming ARM version of EOMA68 was going to ship with the Mali GPU completely disabled because of that.
And: The WiFi needs proprietary software too. As far as I know, no one is working on that.
So: Circling back to your original question: "Do you think then, if Trisquel could run on arm, could it run on this specific laptop, the Pinebook Pro that could easily become an affordable free daily working station."
If Trisquel did run on it, you'd have no graphics or WiFi. Because those need proprietary software, which Trisquel won't provide. Even if, years from now, the graphics might work (and in the free software world there is never any guarantee of future success), no one is working on the WiFi so the idea about the Pinebook Pro becoming "an affordable free daily working station" is not promising.
Of course, I don't see that any of this is clearly pointed out on the pine64 website. You might want to look into other options.
