So at this point, it definitely seems that a big reason they wanted a full-time nanny is so that when J is in the videos that they can have him stashed away so as to not make filming
AND editing more difficult. If J yells out, runs around, gets into things, etc., then they have to cut the video, or redo specific things if, say, Tim was talking as it happened. I have a feeling this was happening a lot (see: Hawaii with the supposed "J spilled ALL OVER HIMSELF!" scene, where he just dropped a few drops, but it interrupted Tim so much that he got all flabbergasted and had to stop everything to clean him up.) There was a live show where Jenn told stans that they should always come up and say hi, but please don't do it while Tim is talking and filming something. She said then he has to redo it over and over and it makes editing more difficult.
Now, besides them not wanting to have to deal with parenting responsibilities every day, it could have been a good excuse by Jenn that her editing would take less time (
) and filming would be easier for Tim if they didn't have J constantly "interrupting" (aka being a normal kid). It would be an easier sell to Tim OR, on the other hand, a way Tim could have sold it to Jenn rather than admit she can't really seem to handle things on her own.
The hopeful thought we all had that J was going to be out of the vlogs so he could spend time at home, in a relaxing and familiar environment, learning things and just being a regular kid, isn't happening.