Earlier quoted context omitted.
At a previous large company more than once I had to explain that the interview process 'is HR's show'...but once the job starts it is now 'our show' and they don't have to worry about that song and dance anymore. It's frustrating that it is that way, but the hiring at that company was a whole other song and dance that took very little input from anyone about the hiring process.
That’s not how it works at all. First of all interviews are a two way interview. Your company will be judged based on it. Also people come in touch with hr later, and usually in high pressure situations. If HR was difficult during the interview that’s a big red flag for later on in case you have to deal with them.
I don't doubt people judged the company based on their interactions with HR, but that's HR's responsibility IMO. I gave my feedback on a few occasions, but they didn't take any action based on it. At that point their failures are 'not my job'.
As for any other HR interactions most folks interacted with them as little as possible. At big companies (and many others..) I find HR is there for the company to manage risk, not help, I expect very little from that kind of department.