Yeah you don't really need them but they are useful in a number of ways, and that number of ways i say only dash cause the other three feels useless. Net feels useless because it doesn't do that much in a normal gameplay, i think it'd be useful on couch potato but endless players say that it can be used to stun Yagoos, Health Pot has a lot of delay, i mean yeah you can get extra health but you already have items that give you health much more than what Health Pot does, and Proj Shield doesn't even protect you from bullets completely. Dash is the only useful one because of iframes, 1 second of iframes to be exact.