Commanding your demolitions expert to cautiously proceed forward, disarming every possible mine before allowing your teammates to pass, all the while your teammates may still trigger mines in the process, is not enjoyable and not a good design.
In my opinion, when there is a demolitions expert in my team, they should automatically take the lead while I command the team's movement. They should be responsible for detecting any potential mines and promptly warning teammates not to approach. These actions should be automated rather than requiring manual operation by the players.