1.) Artillery is supposed to blow up sapperworks. That huge force decimates stuff like that.
2.) Grenades shouldn't blow up sapperworks. If they do that's lame (wow. what an ableist.)
3.) Sappers should have a more advanced role. It seems they're a bit of an antiquity in IE right now. How to make them more relevant, I'm not sure.
4.) Should definitely rework how sapper axes fit on the back same with shovels. Also include an option to take either axe or shovel and not both, because some units just need sappers to break down wire and set explosives.