The small ships are not very versatile. They simply don't have room to do more than one thing. You want exploring, drop the cargo. You want trade, drop the scanner. You really want trade, drop the shield generator. You get the idea.
Being able to carry a wider range of equipment is basically what the bigger ships are about. The first time you get into a Cobra, you feel like there's no limit to what you can do.
Then you realize that you can't equip that baby to explore / bounty hunt / trade / mine at the same time, and while you can certainly equip for two or even three of those, you start eying those extra slots on the Asp with some longing...
;-)
As for deep space exploring in a Sidey... you still only have three or four jumps in that fuel tank, and not all the stars out there can be scooped, so pay attention to your fuel levels and the distance to the next "known good" refuelling opportunity. Getting stranded out there isn't fun. ;-)