The hassle of the numbers is intentional. It's supposed to be difficult to change face. Karma isn't who you are, it's what you're perceived as, and this affects your powers as a navi.
To make this simpler is to invalidate the ties between mechanics and story - it's difficult to redeem oneself, but easy to fall once you've become a paragon of good (part of the reason that Dark Karma is easier to get then Light Karma.)
As for hiddens, when's the last time you've actually interacted with someone who has hiddens? Just ignore them and they go away.
encore: HOW DO I ADULT EGG, COLIN Colin: it kinda just happens eggs
I don't think that is right though. Karma is a large part of who the navi is especially how the mechanics are set up at the moment. Think about this in terms of the mmbn series as a whole. Darks navi's identy is heavily influenced by being evil. Another point to note is thinking about the members of the site, how many users have shown up made an "evil" navi then left into the void. I think a large part of that is because of how much a hassle the karma system we currently have deters people from even delving deep into it.
We've contemplated letting people choose their Karma on creation. If you decided to change it at a later version for whatever reason, we'd just let you do it -- nothing extra required.
Pure Light and Ultimate Dark are ultimately acquired by reaching 100 of either extremity, but if we decided to Nix the numbers, wouldn't be difficult to find a new way to get those.
Only real issue is that Karma is one of those legacy features that have always been around, so removing it creates unfamiliarity for older members that return. It's a thing that'd best be pursued only after gaining Raven's permission to do so.
So I don't disagree, but gonna keep working on my current projects until I get the chance to talk to Raven again. In the meantime, it wouldn't hurt to make potential plans for replacing the numeric system, but I have to stress that they're potential plans -- those rarely take effect.
Things it would affect, off the top of my head, are:
Light Element Dark Element Pure Light Ultimate Dark Dark Chips Dark Accessories Navi of the Month End of battle Karma gain (though this is minor)