According to GSMarena, the "Microsoft Surface Pro 4" put up a good fight before the iFixit team was able to unleash the secrets from the inside of the device. It was said that the screen was put together by means of glue and two cables. But even after the glues and cables are taken out of the way, it was still difficult to access the motherboard.
Inside the device is an M.2 Samsung SSD which may bode for upgradeability. But the RAM is soldered on the motherboard, which loses all hopes for upgrades on that area. Above everything is a copper heatsink and an empty surface, which can be assumed as the space where the fan goes on in the higher models (the device they used didn't have one).
As a whole, iFixit gave the device a repairability score of 2 out of 10, which is rather low and close to unrepairable. The only good thing the experiment resulted to is the knowledge that the SSD is swappable. But the rest of the parts, including the glued screen and the glued battery -all of which are hard to repair.
However, despite the low repairability score, people's opinions still vary. Some suggest that repair is not at all necessary because of the device's warranty and Microsoft's professional services. Some also think that the iPad is even harder to repair than the Surface.
Nonetheless, this fixing result suggests two of many things - first, the company might have made it that way because of their self assurance that the device is stable enough to not worry about getting broken and needing fixing. Also, we might have already get passed the generation where devices are easily dismantled and easily re-assembled by anybody. Today's devices may be harder to break, hence, harder to repair.