I’ll start by saying that XCOM 2 leans heavily into offense rather than defense in which you are aiming to eliminate as much of the enemy as possible before they have the chance to retaliate. While there is plenty of wiggle room for building your soldiers however you so feel, there is certainly the ideal way to have your squad function and an ideal place and role for every class to fill. X-COM as a series is grounded in preparation and squad management, knowing your abilities, and planning for the enemy’s actions ahead of time.