Eh, I’ve dealt with enough people to say nah - people really should not be doing their own structural engineering, or electrical.

It isn’t due to ‘complexity’ either - rather indifference, laziness, or just plain stupidity.

I’ve seen people almost burn down their places multiple times - and at least one family actually die from an electrical fire. Also, partial building collapses.

The reason you don’t see it more often is because people generally don’t actually try.