Most companies want all general internet traffic to go through the VPN so they can filter/record/do whatever to it. The sites that are split tunneled are usuall

Most companies want all general internet traffic to go through the VPN so they can filter/record/do whatever to it. The sites that are split tunneled are usually trusted internal (in that they're owned by the company, or used for a known service like email) or known high bw but safe (like youtube)