The problem with people contacting ground as they are vacating the runway is that they didn’t vacate YET. The command says contact ground when OFF the runway. So you shouldn’t be contacting ground before crossing the H/S line. So in IF, you need to pass the H/S line, contact ground, stop, request taxi, continue taxi. In real life, the frequency of ground control is already set, by the press of a button you are with ground and you are cleared really fast. Also, the tower issues you a more complex instruction to vacate to runway to keep you rolling. So that’s why if you’ve already took the plane IRL you’ve noticed that most the time you don’t stop after the landing. But this is IF, so just follow exactly what the commands say and wait before clearance for everything.