Many people find a page builder UI easier to build pages with, but such plugins add another layer of complexity which can on occasion cause conflicts. An actively maintained plugin will soon correct any conflicts that arise. Generally, the layout options available to you in a page builder are limited to some extent. Experienced coders can get frustrated by this, but the inexperienced never notice the lack.
If you are comfortable with HTML and CSS, you don’t need a page builder. Otherwise, it can be useful. IMO, even better would be to learn HTML and CSS so you don’t have to rely upon a page builder. It’s not for everyone though.
You might consider trying the Gutenberg plugin. The UI is slated to soon become part of core WP.
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