This is a request to actually bring Better Permissions module functionality in core:
The module is fairly simple, but was never ported to D7/D8 (https://www.drupal.org/node/937208), so the UI in the screenshot might not impress at first.
I think the addition of a global expand/collapse link somewhere at the top + making each permission group expandable/collapsible would be great. I'm not sure about the way Better Permissions expands/collapses rows though... - when all rows are collapsed, selecting a row expands it - but when selecting another row, the previously expanded one collapses - so only one expanded row at a time
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Thank you for sharing your final solution. This may be very helpful for future visitors trying to do the same.
Views Accordion as primary navigation
I think this is good enough. Thanks for the surprise, @yorkshirepudding! Here's the CSS i use for future references. (Works on black, very minimal): /* ========== ACCORDION...
Views Accordion as primary navigation
Glad to hear it helped
Views Accordion as primary navigation