My question is why bother reinventing the wheel?
First of all - you don't have to learn to "read" anything. You have two ears, fingers, and a memory. So all of this reading, writing, and 'rithmatic is for a bunch of academics who have nothing better or lack the ability to it the "Old fashioned way". Some a-hole, however, went and re-invented the wheel and then we had standard notation. Hold on to that notion....
Second, on MOST instruments there is only ONE "C3". If you have ever played with a keyboardist and they said play C3 and you asked which one, you saw their head explode - because there is one and only one place to do that. However, on a guitar or bass there are multiple places to do that. Depending on the choice, it may be more or less difficult to play a particular passage, or even impossible to do so in time and accurately.
Tablature wasn't invented as a way around classical notation, it was created as a way to make it clear that the specific C3 was at this fret, on this string, and gotten to by a slide, bend, pre-bend, whammy drop, or whatever.
You want to know why we are not any further than we are as a species? Because a bunch of old set in their way geezers keep hauling out the "Why re-invent the wheel" excuse because they are too old, too stubborn, or too arrogant to change their ways.