As the title says. The really important stigmas are barely dropping at all (Vaizel's, Splendor of Purification, Sage's Wisdom, Doom Lure etc..). This was ok in retail 2009 cause you needed weeks to level up, not here where some people are already 50 in 2 days. Retail solved this with a stigma vendor NPC.
So your options to play your class are:
1- Stay level 20/30/40 for weeks or months, do your x runs per week, log off and don't play again until next reset in a week
2- Create new characters and play everything all over again to run again Haramel/NTC/FT/SR
We are not in 2009 anymore, retail progressed slowly and gave people enough time at the beginning to drop/obtain these. As the game progressed in patches, they recognized this issue at later levels/faster leveling with a stigma vendor npc, but here we start in 1.x with progress rates of 2 or 3.x, this is a huge oversight of classic, without these you can't even use your advanced skill trees.