Thank you for bringing up and discussing this topic. I don't know the Redux plugin, so cannot say anything about its quality per se, but their above shown overlay solution for the block patterns inserter comes very close to what I would like to have for my own work -- all categories in a narrow column on the left, with the main part of the overlay showing tabs like, e.g., "Sections" and "Templates" (both of these being part of a hopefully growing WordPress library) and then two tabs for "My Sections" and "My Templates". Something along that way, and it will be a pleasure and no problem at all to quickly select the right choice among many hundreds of patterns.