Thanks for the feedback @dennis . We will have to see what my Fiverr Developer comes up with but from what I can tell the core functionality works with the current dashboard. I cannot test URL lists (broken, etc) as this data is not properly populated in the URL database due to a PHP error on writing to the URL db. However, status info is properly populated into that database. Core functionality (dash status, overview screens, etc) does work in the current dashboard.
Main Overview Screen: MainWP ‹ Subsilio Consultin...
Extension Overview Dash Screen: MainWP Broken Links Checker...
Site Overview Screen: Sites ‹ Subsilio Consulting...
URLs Screen (not populated b/c data missing): MainWP Broken Links Checker...
In addition to the longer post called “Bring Back Broken Link Checker” that I originally contributed to there have been a few other posts asking about this
Given this interest it is odd that there is no official request on the Feedback Board about this so I will remedy that situation. As I have also mentioned, all main competitors include link checking in their core products (I will not provide the links here for obvious reasons) so to me this is core functionality. Also, as I have noted - I LOVE MainWP and we are basing our entire WordPress update cycles around your Pro product now so beyond this feature I love, love, love your product.
Given that the Main WP broken link checker extension appears to “mostly” properly communicate with the broken link checker plugin when installed child sites if you maintained this methodology it would initially appear to be trivial to renew support for this plugin (time will tell). While there is some disagreement about whether the broken link checker works effectively on child sites it does have 700,000 active installs - Broken Link Checker – WordPress plugin | WordPress.org.
I will post a feature request shortly (maybe not today but by early next week). I will also keep everyone updates on what my hired Dev figures out and will give him the info you shared from your Dev site.