I have seen that YouTube video review, watched it a few times. The guy gets pretty picky about some things that he "Thinks will go wrong". There is a big difference between what some YouTube poster thinks and what will really happen. Some of the things he mentions are just "out there" and are a whole lot of speculation on his part. I don't know what makes him into an expert.
As for finish wear, big deal. There is a big difference from wearing off some of the black and wearing out the metal in the receiver. The finish on any firearm, such as the slide on my pistols, will quickly wear at certain contact points. This has not caused any problems to those hand guns however.
As for the screw on the charging handle, I think a few people make too a big deal out of that. In a normal cleaning there really isn't any good reason to remove the bolt. You can easily clean the internals by just locking the bolt back. Even on a lowly pot metal High Point 995 (which is a lot of trouble to take down) they will tell you not to worry about doing a complete strip until around 1,000 rounds. You will see Hi-Po's with thousands of rounds through them and they are friggin' zink pot metal! So, I have no concerns with the JRC. After all, what is an AR receiver made of? And for cleaning, I continually read of people bragging about how many thousands of rounds they will put through some firearms with minimal cleaning.
I think sometimes we worry too much about things that will likely never happen.( There is an old saying that 90% of the things you worry about will never happen anyway). And, we have too many "internet experts" spouting off their person theories about how the world should be. All too often their personal biases get in the way of frank and objective reviews. But, its your money, go with what you want and trust.