It wasn't that bad because I do got the emblem when you complete all of the missions on grandmaster as well as the legendary campaign. The most important key with these kind of content especially with higher deltas is place smart play safe it's not just be good at the game or have a good build you also have to play tactical you can't just rush into an encounter blindly. I've seen people do that with the grandmaster version of the edz battleground for the conquest they do that and they end up losing almost 8 revives..

Yeah it has a modifier that indicates enemies scale. But they are still weaker than pinnacle ops under 30 enemies tbf

They were probably brought in line with the power delta in conquests. The portal activities on the other hand have a separate power delta where ultimate difficulty more or less corresponds with pre-EoF master.