are you kidding me? maybe not for you considering you are 16 thousand posts deep and have been on here for 6 years, but front/back gears and both derailleurs on top of the shifters are a bunch of components that you would need to be knowledgeable about in order to install on your build yourself on top of maintaining and tuning.

if novice rider A buys a track bike, and novice rider B gets a geared road bike, B would need to know about everything A needs to know on top of everything ive previously mentioned. and i think its safe to say gears/derailleurs/shifters are some of the more complicated components on a bike.