I feel like Anna complaining even with the nanny there is not just to seem relatable for the vlogs, but cause she definitely had more kids than she can handle. She obviously cannot handle 4 kids, and even if the nanny is minding one or two I feel like its a lot for Anna, when people ask them why did you have 4 then? Easy, they though all of her kids would be like Emilia, the easy child. then Jonathan saw the views and growth convinced her for more kids and more money so she went for it (because she loves her luxury lifestyle too). Anna has said multiple times how she was physically and mentally ready to stop after Eduardo and because of that they will have a nanny as long as all the kids are still kids and she will complain always, because she crossed her limits.
As for the nanny taking the kids as oppose to their parents, I think its better, if the nanny takes them it means more real actual fun for the kids, kids being kids just enjoying life as they should, and less of camera time = less work, if Anna and Jonathan were there they would film all they do. This is not a normal family, if they go somewhere and do something they have to document it all, so its work for the kids. (I haven´t watched the vlogs since 2 weeks ago Im basing myself from what I read, so I dont know how much was filmed bit Im guessing not as much as if they were with their parents, because one person with 4 kids seems like a handful)
As for the nanny taking the kids as oppose to their parents, I think its better, if the nanny takes them it means more real actual fun for the kids, kids being kids just enjoying life as they should, and less of camera time = less work, if Anna and Jonathan were there they would film all they do. This is not a normal family, if they go somewhere and do something they have to document it all, so its work for the kids. (I haven´t watched the vlogs since 2 weeks ago Im basing myself from what I read, so I dont know how much was filmed bit Im guessing not as much as if they were with their parents, because one person with 4 kids seems like a handful)