To my way of thinking it sort of depends upon the use and preferences of the person.

I have the flip safety on all my shooters. A real improvement.
None of mine came with a round bolt so flat it is.
When I rebarrelled a receiver with a commercial barrel and put it on a repro M1A1icon stock for a trunk gun (fits well into a padded tennis racquet case, but that is another story), I put a type 2 band and flip sight. Felt I didn't need a bayonet, and the flip site seems less likely to get out of wack. and looks "cool"