There needs to be a guide as to practicality of a song for people at different skill levels. You actually think II-V-I is the most important part important part of bass? No, the most important part of the instrument is getting people to actually pick it up to play it, and if it requires a level system to get people to progress, then so be it. So if you're looking for a thread where people talk about the virtues of TAB rather than getting them to actually play something, I invite you to find one of the other trillion threads that already exist on it.
That's the first and last I'm going to say on this.
There needs to be a rating system for people to get up and play the bass? Seriously? So I guess for the thousands of years musicians have been training and performing nobody got any better because there was no rating system. Now, thanks to your brilliantly designed system, people can actually progress and play their instruments.
Thank you. So very, very much.

