Good article/blog.
Missing the one technique that makes my vocals stand out the most though: Sidechain compression towards tracks that interfere. Immensively important in many/most of todays styles.
2 big advantages for this in my mixes:
1) You don´t have to strangle that frequency area when the vocal mix does not "sing" and
2) Using absolutely just the necessary amount of SCC this way vocals pops out fantastically clear without hearing obviously that SCC was used.
FYI: The below track did not use this technique. I wasn't aware of it at that time 4 years ago. Still I think I made the vocals clear enough. Mostly because there wasn´t too much going on in the vocals frequency area. In other words, I tried to fix it through the arrangement.