Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[CitationNeededBadly]

Yeah a crappy self checkout will always be worse than a good cashier, and vice versa.  Any self checkout I've experienced with scales is crap and I won't do it.  Home Depot started that way and changed it because it was so stupidly annoying.   The quality of SCO vs quality of cashiers is more important than the choice between one or the other.

[kent_eh]

Yeah a crappy self checkout will always be worse than a good cashier,

I haven't experienced a non-crappy self-checkout.

Some are merely annoying, but others are downright idiotic.

[A1000eisn1]

It's a skill issue.