you never *need* to use tubing. I very rarely do so and it doesn't stop me catching fish. Tubing has it's purposes - to camouflage line and help pin it down. Personally I find that using a sinking line and pulling a *few* inches of line off the spool when setting your rod lays the line flat enough on the bed to avoid spooking fish in the immediate vicinity of the hooklength. If fishing deeper water or at very close range then perhaps a little more slack. That is normally enough.
In short, the simpler you can keep your tackle, the less there is to go wrong. don't be seduced by racks of kit in tackle shops, much of it is not essential, and you can spend the money better on good quality hooks etc.
a simple sliding rig, with a hook-length of a lighter breaking strain than the mainline is simple, safe and effective. If/when this arrangement is insufficient for a particular problem, then maybe think about a solution, but trying to solve problems before they arise leads to over complex rigs, and if you are not completely certain that the solution is necessary, it is probably better to leave it.