How do I obliterate all vestiges of category so I can start over?

I upgraded from 4.7 to 5.1 and it was a disaster. It is impossible to list all the things that went wrong. Here are just some of them: Containers having their parent category "unavailable". By this I mean I would be in the Container listing, where it shows the parent, and clicking on the parent would take me to my home page. Of course, the parent is there, and editable, just not reachable. Create a new category, modifying the original only by adding an underscore to the name, then editing the container to associate it with the newly created category results in a clicking of the category finding the category without problem. Permissions were FUBARed and things that were wonderfully accessible in 4.7 were off-limits in 5.1 (I guess that is better than the alternative). Editing or creating a node in 5.1 with any category association resulted in multiple key violations along with a mysql error when "td.nid in ()" found its way into the query (without anything in the parenthesis, the query was doomed). Diabling TAC_lite fixed the query errors but not the key violations.

I then edited all of my nodes to remove any selected categories (replaced with "none") and then I deleted all of the containers and all of the categories. Rebuilt permissions. No more key violations.

I would have thought that would be good enough. Nope. When I re-inserted a single container/category hierarchy, I still have the same irrational taxonomy access (that is, it is inconsistent with perms). I have it narrowed down to two nodes, on a single category hierarchy, with just two roles (authenitcated user and anonymous user). One is supposed to be private, the other public. So even I can't mess that up. When the perms didn't work right, I tried rebuilding perms again. That didn't help.

In any event, will just uninstalling the following two modules allow for me to either (1) reinstall and get my beloved Category modules and TAC working again or (2) use Drupal core taxonomy to effectuate my access control?

Category Access Control - lite
Category

A subquestion is whether uninstalling Category module will revert the wrapper modules of taxonomy and book to their original version, or will I have to do that manually?

I am presuming that by uninstalling Categor, the following modules go away gracefully:

Category display
Category export
Category legacy
Category menu
Category outliner
Category pathauto
Category transform
Category views

Thanks