I guess I don't expect her to change the world. So low are the standards for historical knowledge today that on those occasions when she provides some -- any -- I can't see it as a bad thing. The fact that she doesn't tend to bring a "now what" message is, to a good degree, why she is popular. She's not particularly dangerous to be sure. Except that she does bring information...good information that is generally attributed (if only her essays could be hot-linked or footnoted they would be even more effective in that regard).
People are responsible for intervention and they've need to be armed with historical facts, context, and current connections to be dangerous. HCR is most definitely not a revolutionary...Zinn could lean into that, so too did Cornell West once upon a time. Jamelle Bouie makes a mark frequently as does Ta-Nahesi Coates. Greg Grandin is increasingly radical though he too remains dedicated to the primary sources. Marcus Rediker goes there at times. Jill LePore stays pretty tightly within the profession like HCR but makes important points that the public sometimes benefits from because they read her stuff.
I wrote earlier today about the influence that reading founding documents, warts and all, tends to have on young adults -- a thing that I find positive and see as good for the fight against authoritarianism. The majority of teachers 'out there' honestly can't get away with being radical -- they'll lose their jobs and in some places risk being harmed. This is where we stand today. They could die on the multiple hills of choice and chosen issues or they can keep working to chip away. Of course they can also do many other things that citizens do -- at least in some places -- depending on the communities in which they live and work.
There are an awful lot of ways to resist and frankly, I can't find fault with the way that HRC chooses to do so. Do I think that she is somehow actually tamping down activism with her work? No, I can't say that I do. Might she be revving such a thing up? Could be.