Their view on React, Vue or whatever library/framework is half-correct in the sense that many apps and sites actually don't need all that baggage and simple HTML and CSS can easily do the job, so based on that logic those who opt to use them anyway, don't know enough basic web development to properly use React, Vue or anything to build accessible and performant UX. The argument to use a different experience for instances where JS is turned off could become a legal issue. From an A11Y perspective it could definitely be classed under discrimination.

I tend to share about 50% of their opinion but as you stated, I write about it in a less loud and abrasive way and always look at finding a compromise that actually works in the real world.