ww1 would be absolutely amazing, we would lose alot of the deployment options but inflatable boats/rafts still existed and early half ton trucks could be one delivery, A lot of the charm for this one is all the options you are given but just for the experience of trench assaults in ww1 i would be very willing to say goodbye to some of those options.
would probably have to increase your squad size to a company element just because you'd probably lose alot everytime you assaulted, instead of insertion options maybe you could decide the assault order for your trench and your neighbors and how the pre asault artillery brrage is configured among many other things.