Do we need a favicon?

Is it really necessary? If so, why doesn't everyone put it on? If not, then why is it still put?
Undoubtedly, favicon is extremely useful ... It is displayed on the browser tabs, in the address bar, in the bookmarks bar ... It marks your site as unique among others, "faceless" ... It helps to quickly find the link with your eyes, remember your resource ... Probably needed ...

Or is it an empty show? T.N. "show off"? The desire not to be like everyone else, your charter in another monastery of the longstanding traditions of the Internet?

But he was with Yandex, when there was no web 2.0 and no hearing ...
')
I admit honestly, it inspired me to write that favicon began to appear especially actively ... And when I saw it on a more than modest resource in the design - bash.org.ru - I asked myself this question. It became critical for me ...

So do we need a favicon?