Coin doors are pointless on home machines.
About as pointless as building a cabinet.
I can see both sides of it. All of my actual arcade games are set on free play. So I could say coin doors on actual cabs can be pointless
Sadly I havent had a MAME cab in a long time, but when I did, it either had a coin button , or a coin up short cut.
So while aesthetically speaking, a coin door looks better (to me) functionally speaking its not really needed (to me). YMMV.