I think the in-game performance of commanders matters more than strictly following design rules. Your first suggestion should not be controversial at all, but some of the others aren't really balance issues.I agree that "design rules" should not be followed "strictly" and there is fun in some commander like "encirclement".
The problem from my point of view is that it is difficult to balance some doctrinal units because of the "package" they come with and nerfing the rest of the abilities effect other already weak commanders.
I agree that it would be much, much easier to change the superheavy+off map commanders than bring the others up to their level. I would suggest replacing the off maps with a more 1v1-type ability, and struggling commanders can have the off maps.
Nice to see that we agree.