This is an interesting topic and in the article they cover a lot of important points like the ability to easily divide and count on fingers. This all seems great but i still think it's easier to count using one finger for one number and it's also easier if you are trying to show someone at a distance. You can easily see somebody holding four fingers in the air but it's difficult to see which finger and which part they are pointing at. The article also points out that we already use dozens for plenty of things but i can't say that i see a reason why not to use both systems at once. Another counting system i find interesting is finger binary although it is fairly impractical.