@Arcversion
This suggested feature will do nothing to keep you on the Mangaplus website less. What it would do is keep you on
this website less, and make it impossible to start new comment threads for chapters or track your reading progress.
Also quite a few people would probably be miffed at suddenly being thrust into a different website without warning when clicking on a MangaDex chapter link, especially with how many people are flipping their shit at these links being here in the first place.
@YumGumYum
I don't really know if there's a way of doing that that is not A) considered "incredibly suspicious" by popup blockers and B) a huge pain for mobile users
If the system were to significantly change to allow for external chapters to have new comment threads created from the chapter listing and mark as read just by clicking the link, as well as having the links themselves decorated to mark them as external (maybe with a popup dialog warning with an option to have it never ask you again), maybe this could work. That would require major changes and restructuring both inside and outside the reader, though.