Buggy needs fuel? It barely needs any. If you think that buggy needs fuel then you didn't see Hummer in action. Also note that buggy has two seats.
I heard that finding Fuell cell controller is pretty hard. (Never was looking for one neither found one.)
That thing is not something you focus on "MUST FIND IT IMMEDIATELY!!!". It is rather something you might stumble upon.And such it is fine as it is as said. As it is totally random the wasteland doesn't get totally flooded with these things, if you really want it that bad you can still "grind" it, or you just buy it from some other player who did the work already for you.
I find it fun.
But what would your suggestion then be, to make it fun?
This. Basically a place to explore, fight some npcs and other players or team up with them. Would contain random loot, in addition an equal chance to find fcc as now.