Because I don't do the clean by itself. The only time I do is in preparation for an OHP. I am sure I do them with extremely poor form, pick up the bar and get it near if not on my shoulders. At some point I may look into doing them in the future, but right now I do not like to leave the ground when lifting weights.
This It all gets harder as we get older, but the fast lifts seemingly more so. Case study of 1 (age 64), I'm a Cat. 4, half-way to Cat 5 deadlifter, but can eek out a barely Cat 3 PC on a very good day if the stars are all aligned. Us old guys can be advised to approach the tables accordingly.
I'm glad that despite your reservations, you've reposted the standards Rip. Back in the day, I got injured a lot playing contact sports. Not coincidentally, I was below category III strength levels. Even worse, I was only doing body weight type drills or nautilaus machines per coaches instructions. If I'd have known what reasonable strength levels were and how to get there - I would have done it and spent far less time on the sidelines.
Now I'm a coach and these tables are a useful tool. They don't have the important subtle points about linear progression but I can monitor that as a coach. Importantly, I can point my athletes towards the tables, give them the caveats, and give them some good strength goals that will help them stay injury free. I'm glad the tables are back up.