I don't think the changes made it easier to obtain EMBs from BB's...
For the most part, I thought that Payon bounty boards were the easy ones for the EMB; however, it required me to go to multiple places and farm different monsters which although is not bad, I couldn't just focus on one. I can agree it might have not made it easier for the early levels, but in the later levels, you get boards with 5 different monsters, most in different areas, some not as easily accessible such as Thanatos Tower Floor 3 and on, Some dealt with dungeon access quests such as Brasilis, which although easy, not everyone is gonna wanna go to different maps and just focus on the same monsters. Geffenia on the other hand, is a very long quest to complete 2 missions or so if I recall correctly from the Geffen Boards.
Take brasilis for example, you got most of the monsters on one map and there's many of them. You can repeatedly do these missions and finish them all almost at the same time without having to go to another map. Every 4 missions, an EMB and you're grinding a very good spot for your level.
A counterexample is the Yellow and Red Novus maps, which I agree may have been easier, but that is the exception to this rule because it is the only board with just 2 missions and the monsters are in the same map.
I may have overlooked something but I know for a fact that if I could choose to level up in payon from 1-20 on just spores because of the strawberries and not have to change maps to willows or boas, I would gladly stay there and do the board 4 times and get more from it than just doing 3 boards and only benefitting from 2 (I use spores because the map is more accessible, such as others maps may also be.)
Additionally, Prontera boards 1-20 had quite a few monsters in them in the early levels, so completing all of those missions would take longer and you'd get only 1 EMB for 7 missions, now (if the changes are applicable) you end up with 1 EMB and 3/4 missions completed for the next one.
This is just my observations based on experience and having completed different boards with different characters when I first began on iRO.