Elite mark bills, as well as rank B elite marks, have been adjusted as follows:
The respawn time of rank B elite marks has been changed to five seconds.
The HP of rank B elite marks has been reduced so that they can be defeated by a single player.
Patch notes pretty much say B ranks are soloable now. A and S ranks can't be soloed, but you can still gain access to allied notes by doing the B ranks with the dailies. Also dungeons would be nice to have allied seals drop, but if you are also gonna with guildhests, and leves, you have to go with trials as well which is perfectly fine with me. GCs deal with the primals as well and they are sure as hell a bigger threat than most of the B ranks, if not all.