What is wrong with HRs/Recruiters

So recently I interviewed in many companies including google, Microsoft, Amazon I have seen common pattern that HR not being transparent with candidates. They keep hanging candidates in between and not reply to text, email, messages, calls. Even if candidate is rejected why can’t they email or call to give feedback. Is this job really hard ? “If I will get a chance to snap out one profession from earth I will snap out all hrs, recruiters out there.”

Ps:- Google ppl was very transparent throughout process one of best experiences for me .