Alex always does an amazing job at explaining and more importantly visualizing how effects work in visuals. He always puts a ton of work into those videos you can tell. He was an amazing addition to the team. I love the vids he does with John; those two make a good team.
Yes i also like how he talks about tech, like how he always explains ray tracing etc. He has a happy tone to his voice while doing his videos. Imo, DF was mostly only console oriented before Alex joined, which was kinda sad since PC is still the biggest platform out there, where tech always comes first before consoles, like ray tracing, SSD etc. In these premature days, alex then covered and explained what we can expect, and it was spot on i think.
The PC remains a very intresting platform, it can't be ignored and needs dedication which they have solidly covered now, with true passion.