I have all the colours and Pens I want, I don't stack tons of paperwork on my table like I used to, (because I got 20KG Paperwork of art under my bed) I can erase mistakes very quickly and easy.
Because I use to make Mistakes on paper, not that something is wrong, but when the pen breaks and his ink dropps at my pic everywhere, that pretty much sucks.
I still do tratitional Art, sometimes, and its not that I would become worse with it. I use tablet now for ... sheeeeeeee..... almost 6 years. But only 3 years of Sai. Sai is awesome.
HEY you can stick to your paper and pen as long as you want, but you should get a software to colour and edit that stuff. You were not even able to recieve my PSD, that sucks dude. Get Sai, Somewhere on this wide Internet you can get it for free, more or less. Actually it only costs 40 or 50 bugs.