So what you're saying is Royal Engineers fill the same role as Infantry Sections except cheaper while Pioneers have their own unique role of being a scout and Garrison clearer woth Grenadiers and Panzer Grenadiers doing the front line unit roles
Royal Engineers also have the task of repairing and maintaining the emplacements they build so they can get busy on that behalf aswell as vehicles so if you gave em double brens they wont be using them while an infantry section could be making use of the Brem in battle
Other then the usual engineer stuff they dont really bring anything thats unique from the rest of the army unlike pioneers
This is off topic, but still all other engineer units (most notably CEs and Pios) have more tasks than REs for nearly the same price. Retreating a builder unit for base building is huge. Their repair speed is also better than other units, and please, who builds and maintain emplacements?
Lets agree to disagree.