Why are WordPress's three Term tables designed this way?

Why are WordPress’s three Term tables designed like this? Can’t wp_terms and wp_term_taxonomy be merged into one table? What are the benefits of this design? The query has to be checked multiple times.

wp_terms

<code>term_id：分类ID
name：分类名
slug：缩略名
term_group：未知</code>

wp_term_relationships

<code>object_id：对应文章ID/链接ID
term_taxonomy_id：对应分类方法ID
term_order：排序</code>

wp_term_taxonomy

<code>term_taxonomy_id：分类方法ID
term_id：
taxonomy：分类方法(category/post_tag)
description：未知
parent：所属父分类方法ID
count：文章数统计</code>

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Why are WordPress’s three Term tables designed like this? Can’t wp_terms and wp_term_taxonomy be merged into one table? What are the benefits of this design? The query has to be checked multiple times.

wp_terms

<code>term_id：分类ID
name：分类名
slug：缩略名
term_group：未知</code>

wp_term_relationships

<code>object_id：对应文章ID/链接ID
term_taxonomy_id：对应分类方法ID
term_order：排序</code>

wp_term_taxonomy

<code>term_taxonomy_id：分类方法ID
term_id：
taxonomy：分类方法(category/post_tag)
description：未知
parent：所属父分类方法ID
count：文章数统计</code>

wp_term_taxonomy is a tree-level structure, so term_taxonomy_id is necessary,
and wp_terms is a classification table. Classification things will often use the id, and the id cannot be omitted, so we built two and a half tables

That’s true. When I came into contact with the e-mall project, I couldn't stand the form of the project. It could be made into one but it had to be split into many single forms. What I do now is to write a view based on this and combine the forms as a new table to use, which is much more convenient. I hope it will be helpful to you~

I really don’t understand why these popular website building programs use so many data tables. If I designed it myself, all data tables would not exceed 15.
Of course, if the amount of data in a single table is too large, it will be very frustrating for MySQL.
You should ask the WordPress people about this.