I personally don't agree, and my experience is that RSCs embrace the inherent complexity of building websites. All websites span the server and the client to some extent. Giving you the tools to wield those boundaries is actually a bid for developer autonomy and flexible control over user experience.
It is complex because the domain is complex. Though it requires a deep understanding of the web as a platform, most high-level websites could net-benefit from the ideas behind RSCs. I don't find it to be quite as much of a footgun as most people would suggest, but if you don't understand both server and client in a deep manner it is, of course, confusing.
Happy to dig in deeper for anyone who wants to have an honest discussion about the benefits and drawbacks without dropping into FUD. Even if you decide it's not for you, all web developers could glean something from their model.
It's also always worth noting that RSCs don't require a server, and still bring value without one.