Suggest marking as Completed after you read the chapter marked as END :rejected:

[Nolzi]

I think it would be a nice quality of life change to suggest marking the manga as Completed after one reads the chapter marked as END.
Doesnt happen too often, but I just found that I had finished a manga and never marked as completed (and probably never would've if I wasnt required to look through my reading list)

 

[Teasday]

There's a few problems with this:
1. The END chapter isn't necessarily the final one. There's many cases of this.
2. As the follow and read marker systems currently stand, a title in the Completed category will not show up in the default page of your Follows, and all markers would be automatically set as read.
3. We would like to revamp the category system anyway, so it might not make any sense to set up this automatic behaviour only to deprecate it sooner or later.

 

[omae_wa_mou_shindeiru]

as Teasday said Finale / End chapter does not mean final one.

After Finale/End Chapter there are Epilogue or Extra chapters.