What's so bad with the idea of herd immunity?

So we know (supposedly) that the vaccine will prevent people from getting sick and dying if they catch the disease.
And by now, anyone who wants the vaccine can get it.

So what's so bad about the idea of herd immunity now?

Let it spread, eventually enough people will have become recently infected by it that they will develop an immunity and it will be unable to continue to spread.

Can someone please explain what is wrong with this reasoning?

The whole "herd immunity" idea was presented early on during the pandemic, but was seen as unacceptable because too many people would suffer serious symptoms and die. But now that vaccines have become widely available, we have to reassess that reasoning, wouldn't you agree?

 

Maybe those taking these vaccines are not that confident in the vaccine's ability to protect them?

 

Herd immunity is a natural biological process. Only pharmaceutical hubris contends that the needle is superior to natural immunity.