AC21 did so many things in 2000. It temporarly incresed h1b quota, recaptured unused eb visas (one time), job change after 485 pending 6 months, removed country quota in eb visa allocation, if demand is less than supply etc... The job change during 485 pending, removal of country quota are permanant change.
The recaptured eb visas (more than 100,000) used to clear backlog in eb catagory. All the recaptured numbers used to clear backlog in eb3 catagory, though it was recaptured from eb2 and eb1 catagory in previous years. The sad part is that the extras visas had been available for four years, however USCIS did not process enough 485s to use all the visas till 2005. In 2005, they approved 242,000 485s and used all 100,000 extra ac21 visas. However, there is no rule or guidlines to DOS how to allocate unused extra visas. As, there is no specific guidelines/rules in AC21 how to allocate unused visas to clear backlogs, therefore it has cleared most of the India-Eb3, as it was most consuming country. In that contest, it is logic to allocated more numbers to India. However they totally ignored EB2 demand, though all the extra numbers came from eb2 & eb1 pool. In that logic eb3, (whether India or ROW)folks were lucky.
What DOS majorly violating now is, it is not quarterly basis calculating supply vs demand in EB2 catagory and not allocating unused visas to Indians at the end of every third month of the fiscal year. Why I am confidently saying that, in 2005, they issued 242,000 eb visas (140k regular+100k ac21 recaptured). Out of 242k pool, eb2 was just 44,000 only. It clearly indicates EB2 demand is very less. In fact it is less than EB1. In last year number of approval of EB1 were more than EB2. Furthermore, throughout 12 months in 2005, eb2 India were "current". Even, India and China were current entire year number of EB2 approved was 44,000 only. However in 2006, India was heavily retrogressed strarting from the year, while ROW was always "current". Therefore it is very logic to conclude that there is a big violation in the allocation of EB2 visas.