Why is it bad if the title tag of a web page is too long?

Why is it bad if the title tag of a web page is too long?

The reasons why the title tag of a web page should not be too long are:

1. The search engine's index of web page titles only stores the first 64 bytes of the title. The extra part is represented by three dots.

Try Baidu and Google, is that right?

2. The importance of keywords in a page is determined by many factors, one of which is the proportion of the keyword or keyword phrase in the title.

For example: when other conditions are the same, one title is "I love Baidu, searching for a girlfriend is cool and refreshing", and the other title is "I love Baidu, Baidu is great".

When users search for the keyword "Baidu", the second one is obviously ranked first. But which of these two titles will generate more traffic?

If the two are ranked first and second respectively, which one would the user be more likely to click?

Therefore, when controlling the length of the title tag of a web page, you need to consider the importance of the slogan. There is a trade-off here.