@demomanowar containment risk, veil-breaking potential, and personal risk are all useful metrics to keep track of -- and distinguish from each other -- when dealing with things like SCPs. but honestly, it seems like your real complaint isn't with the classification system so much as the fact that the site itself has changed over the years, and that's just a natural consequence of people continuing to use it. you can only write so many articles about teleporting old men and transmogrification machines before wanting to try something new.
the only way to prevent the canon (such as it exists) from becoming a convoluted mess would have been to lock the site around 2011 and ban all new articles entirely. what the foundation was "meant to be" in your view isn't really relevant, and trying to impose that view on newcomers who don't share your attachment to the way things used to be won't improve anyone's experience with the site. it's just introducing unnecessary drama over what is ultimately a stylistic preference.
I agree that the old articles are good, but they're all still there, and they're still the ones most people will see first when they're introduced to the site. (if you google "best SCP articles" expect to see a lot of 173, 106, 682 etc.) the only difference is now there are more options. people can read your favorite curated creepypastas and walk away satisfied, or they can stick around and see what's new, and personally, I like what they've done with the place.