TinyMCE Plugin Parameter

Trying to avoid using a plugin as don’t want to have to deal with stuff like not being able to upgrade WP because the plugin doesn’t support the new version or the possibility that the plugin may stop being upgraded indefinitely to support future versions.

So yeah, trying to find a way for WP to stop removing my <p> tags and doing the above seemed to do it, but wondering what the purpose of that plugin is!?

I know TinyMCE advanced has what I’m looking for, but as I say, trying to avoid using a plugin for core functionality such as this.

No no, I still want WP to add <p> tags, I just don’t want to remove them when I’m switching from visual to the html editor.