If you shoot an entire wedding, you still prune and throw away three or four for every one you keep even if you're considering your shots.
The formal portraits will be different because you've got perfect studio strobe lighting and subjects that are posing for you. The rest of the time, you limit strobe use to fill (usually) so you can capture the ambiance of the venue. You'll be using even the very best camera outside the range where they reliably produce technically good results, so you shoot several shots for every one finished picture you intend to present. You aren't shooting still, posed people so you shoot when you anticipate something photogenic is going to happen. You'll take many extra pictures to make sure you catch fleeting magic moments. As you learn human nature and body language you can cut down on the number of extra pictures, but they aren't eliminated.
If everything's gone great, nearly all of the shots will be technically very good and you'll have many that are almost alike. You pick the best of the similar sets and cull the rest. The others were there for insurance, and are kept only when needed.