Most of the last season episodes were weak tho I actually liked 3 of the 4 you listed.
I do agree that the one about the children was awful.
“Most of the last season episodes were weak...”
I recently watched “Chaos on the Bridge”, a documentary I found on Netflix about Gene Rodenberry and the difficulties of the series getting started.
If you are not afraid to hear some “unflattering” things about Gene, and a few others, it is “fascinating”, and you can see how in-fighting and the changes in production personnel affected each season... It explains a lot.
Live Long and Prosper!