I have a lot of respect for Paul. His PC builds are usually realistic and his observations insightful. I should also note that he has an existing FreeNAS build again on an Asus motherboard.
I vaguely remembered watching his FreeNAS related videos a few years back, so I've just gone back and watched his build video and the "4 Things My NAS Can Do!" video. I could nitpick about a bunch of stuff but that would muddy what I see as the single biggest issue with his and most other youtuber's videos about FreeNAS. The following quotes demonstrate my point.
"It is definitely recommended to get a USB drive or separate small drive to run the OS off of. Okay, that's about all I know about FreeNAS so far."
He also provides a link to some basic setup videos that he found helpful as "I'm learning as I go".
My point is simple. If a person doesn't have a decent amount of knowledge to backup what they're saying when they make a tutorial video or they don't make it clear from the get go that they don't really know what they're talking about, then they should not be making a tutorial video.
If we use cars as an analogy, gaming hardware is like a sportscar. Performance is what matters. Where as the hardware best suited to a server is more akin to a big rig. Reliability is key. The hardware is different but more importantly, despite several apparent similarities, how you drive them is different. What 99% of youtube videos and listicles about FreeNAS seem to be, is someone who can drive a sportscar really well, hoisting themselves up into the seat of a big rig, turning the engine over and honking the horn (because who wouldn't honk the horn given the chance) and then telling all the other aspiring sports car drivers, i.e. their viewers / readers, how to drive an eighteen wheeler.
However, it does seem that the inclusion of a FreeNAS may be just because he had to put something in the second motherboard position.
But we have to remember that this channel is a business for him and the content is the channel.
I'd be willing to hazard a guess that his motivation for using FreeNAS is two fold. First is that he already has popular, FreeNAS related videos where as most similar channels don't and two, most other channels promoting that monstrosity of a Corsair case are going down the route of a second system dedicated to streaming, which I think makes more sense given the type of user who would buy the Corsair case. So it does make sense that Paul differentiates himself from other channels.
As the Grinch has stated more eloquently you use the right tool for the job if you want the best results.
This is one other issue I find. As
@HolyK and
@Ericloewe point out, the price difference between a mid range gaming motherboard and a far better suited, higher quality SuperMicro server board is minimal but it's pretty damn rare to hear that from a youtuber or read it in a listicle.
[EDIT] I did just want to make clear that I'm not tarring all youtubers/writers with the same brush. There's some great, informative, accurate videos and articles/blog posts out there (several of which are produced by members of this very forum, such as Josh Parker Ruehlig, DrKK, Ericloewe and The Internet Monkey to name jsut a few off the top of my head) but they're too easily overlooked by the kind of new user who would benefit most from reading or watching them.