I don't agree at all. React is just as much a framework as a "way of thinking". I use react for _everything_ - because it's a great way to whip out a website - large or small. The "complexity" added is non-existent, unless it's because you are not willing to learn the way to do things. That's not the paradigm's fault, that's just people being complacent and lazy - sticking with "what they know" (which is fine, it's human nature).
Throwing together an API in .NET Core and a website consuming that API in React takes less than 5 minutes to get going.
I get what you say to some extent - and as often is, there is no direct comparison. But let me elaborate a little bit on my view.
LinkedIn may be an online professional network, but that doesn't mean there are no other means of "transportation". I take care of my network by meeting my professional peers a lot. I talk with the same recruiters normally, both in a hiring capacity and a candidate capacity. I know them, they know me. I stay in touch with my old colleagues, some who are now CEOs, others who are programmers, and even more who are still where I met them - some of them I even consider friends - most of the valuable connections.
In the technology community, you can go to many organized events. I participate in both React, .NET, and cloud meetups, and now I co-host some as well.
Your network is so much more than LinkedIn, it's a relationship with actual human beings, which is where LinkedIn often falls short. It does, however, work great as a contact book of "oh shit, I wonder where he is now and how can I get in touch with him" - and then you go meet them. In person. All jobs of significance I have been considered for, and most likely most of what I will be considered for in the future is based on my actual relations with people. "Talk to this guy, I worked with him on X" - it's the same way I hire great people. LinkedIn is a showcase for your resume, what you've done, who you are affiliated with, and a professional point of contact, but it's by no means "your professional network".
I really consider getting rid of my car. I bought it a year ago, but it's only ever sat in the driveway, I never use it.
The funny meta-thing about his post, is that the content he feels adds 0 value, is in fact his own post. He is literally making a post about a tool he doesn't use. It's the equivalent of a person making a blog post about a tv series they don't watch but have seen the trailer for; no actual value to add to the discussion about the topic.
And this is exactly why I turned down a Ph.D. and always thought the community of academia (CS academia in my case) is one big pile of circle-jerk and shitty politics..
Why would you use this over say, Unity or Unreal? Seems more niche, less popular (so less assets/community libraries etc.) and less integrated into...everything?
Throwing together an API in .NET Core and a website consuming that API in React takes less than 5 minutes to get going.