Are mythical items taken into account in the best in slot?

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It seems to me that mythic items are not taken into account in the best in slot, in fact I have set up my setup with no raid items and only mythic 20, and the site tells me that what I currently have is the best (I’m ilvl 412) so I’m a little doubtful.

Under the boss filters you have also excluded all dungeons. Check the column to include mythic dungeons and they should show up.

In fact, while I was waiting for my account to be validated, I finally found it. Thanks again for the reply.