I agree, you don't need 10 sheets, but a simple overall iso view solves a lot of confusion. A box with a hole in it can be confusing if you only see a section of it.
How can it be called a section if there is no relevant section? You can't have Section A-A without having another view denoting what A-A section is.
I am not a drafter, so you aren't getting the Y14.3 technical crap you will get from many others.
putting a half coupling and stub in is basically the same thing. Use a proper branch connection such as a weldolet. Not sure what hot tapping has to do with any of this.