This is one my wife took away from a trade ... wait for it ...
Electricians!
Figures.
But isn't it often true that:
The plumber's house has leaky faucets.....
The mechanic's car/truck is a piece of junk....
The painter's house needs painting...
And the electrician's house has broken/bad devices/fixtures?
And in my case, I have the only home automation system (AMX touchscreen) where the programming still isn't finished (after three years.)
But all my client's programs are up and running.
Back to the main topic.. Romex does make lousy extension cord. And somewhere here on ECN there is a thread where someone used a coiled-up box of romex and it melted down!
Finally on one of my last major installs they used 10/3 NM for the temp lights and it was constantly getting cut/damaged by the trades.