What do you get out of being sell-side trader/sales?

"But after I visited a few BBs, I realized most of the traders/sales are just acting as brokers. They don't care that much about which direction the stock goes or if they get the correct prediction, they care more about finding the matched buyers and sellers and taking commission out of it to make money. (That is just what I understand from talking to people, and please dont hesitate to correct me)"

Have you been sitting with cash? On the equities side, it's definitely an agency-centric business these days. Collect the fee, utilize little balance sheet, and try to leave the day closed out. Even in FICC we are starting to see a cultural shift to a low touch environment.

But it can be fun and more than trying to make crosses as a cash guy; the program trading team does the same thing but on a larger scale across the central risk book and uses various statistical models to accomplish this. And for now, most of FICC still deploys capital and holds positions. While a decreased appetite for risk across banks forces many of these traders to hold positions for shorter periods, a fundamental view still helps traders decide how they want to be exposed. Understanding how the client thinks can also be useful in shading your quotes one way or the other.

"So what kind of valuable experience, or skills will Sell-side S&T people get during their work? I understand they def get the multitask or the communication skills practiced, but any market-related skills?"

Across almost all desks you become accustomed to working in a high pressure environment and develop a pulse for your particular market. The buyside outside of execution guys is generally less concerned by the intricacies of price action, but the experience of it as a sellsider is still valuable. On some desks you may also develop skills in statistical modeling , fundamental analysis, multi-asset strategy, macro analysis, Greek hedging, and even some basic coding in VBA or R.