sambul95
So the main thing here is that your solution is dependent on constantly re-arranging tabs so that current tab switching method (position based) works.
In a situation where one of the two tabs you're working with is newly opened then this works. But for people who constantly have multiple tabs open, its not as efficient. My work flow for example, involves having several always open tabs logged into various web front ends. So to get this working with your method, I need to first re-arrange all my tabs. Even then I need to switch between CTRL+Tab and CTRL+Shift+tab all the time (and also be conscious of which one I need to use).
Just imagine if the OS worked like this - forcing you to re-arrange your task bar every time you wanted to enable a proper alt+tab workflow. I don't think anyone would consider that viable.