I think most responses to his posts are missing that this is the most important part:
> In practice, the only thing that makes web experiences good is caring about the user experience — specifically, the experience of folks at the margins. Technologies come and go, but what always makes the difference is giving a toss about the user.
> In less vulgar terms, the struggle is to convince managers and tech leads that they need to start with user needs. Or as Public Digital puts it, "design for user needs, not organisational convenience"
This is the most important thing. The entire article series is making this point in great detail, and also being very angry at orgs (especially public services!) that don't get this.
I think this message does get a bit buried under invective against React. Surprise surprise, if you do start with user needs, then sometimes that does lead to you building a React-based SPA. I think from Alex's perspective working with organisations, looking at it from the other direction: for any given React SPA, it is unlikely that React was chosen because of user needs.