Is Installing Additional Antivirus Necessary for Windows 10 with Defender & AdGuard?

Hello
I want honest opinions. Is it worth installing additional antivirus for windows 10? as you know it has built-in this Defender. In addition, it scans malwarebytes every week, and I have a lifetime Adguard license purchased.
In connection with the above, I wonder whether to additionally install something. I had to try Bitdefender Total Security 2018, unfortunately I had to uninstall. Because he caused too many problems. And other anti-viruses do a lot of work as in the task manager.
What are your experiences and opinions?

What do you need an additional antivirus for, just the built-in system, I also use malwarebytes myself and that's enough.
The problem with anti-viruses is that they only detect the viruses they have in the database. If there is a new virus that no anti-virus program will have in your database, then you can have even the most expensive anti-virus installed and it will not help.
Common sense counts.

Don't install anything.