Are All Neutrals Attached In The Attic

Attic was rewired in new nm but attached to old k t.
Are all neutrals attached in the attic. The sub panel was put in 8 years ago. 1 for all the cable clamps combined. Attach the black of the new wire to the other screw on your switch this is your switch leg. The neutrals about 8 14 or 12 s were all hastily twisted together and covered in tape not wire nut at all all overcubed in a way too small of a j box a 4 sq metal and the arc bark happened every time the neutral touched the box which was how i knew it was the problem the.
Use the black of the original wire as your line or hot conductor it will be attached to one of the screws on your switch. 1 for all the ground wires combined. He couldn t say why code was changed. The left over white conductors will be your neutrals once you tie them in with the existing neutral wires in the light.
The attic however has a floor so i am wondering if it is possible to blow insulation into the attic beneath the floor without having to tear up the floor. I then attached the zipper chipboard pieces painted with some bronze 3d paint scribbles and glued it behind the edges of the paper. I m sure that ideally you would want to seal all ceiling openings and possibly fixtures but tearing up a 2000 sf of 165 year old floor seems like it could be a bear. Energized conductors in sub panel pig tailed to romex which enters into the main panel grounds and neutrals attached to the main panel bus bars see photos.
Talked to an electrician that said this would not be to code today however it was ok 4 or 5 years ago. 2 for each device switch or outlet but not light fixtures multiply the total by 2 00 for 14 gauge wire and by 2 25 for 12 gauge wire to get the minimum box size required in cubic inches. The title and the number chippies are from dusty attic as well.