Well bankops, that seems to be an absolute turnaround from what you said in the other thread. Considering the fact that my fifth set was inserted in London not too long ago and they didn't say a word about it, it would seem to negate your statement. IMHO no mission has ever had a two extension limit.
The popular thought is that when they add pages they scan/copy your entire passport, hence why some try to limit the amount of additions as it creates more work for them. In any case as I stated on the other thread and whch is now the case, due to the huge backlogs in everything passport related not only are most missions abroad not saying anything about any number of extensions, but in my case recently (less than two weeks ago) added two sets instead of one without me asking "for my convenience".