Why use a wrapper at all instead of pasting partner tags?

Why use a wrapper at all instead of pasting partner tags?

You could paste each demand partner's ad code straight onto the page. A wrapper is one referee that talks to all partners for you instead.

— No wrapper, raw tags: partners load one after another, so the page waits in a slow line and the last partner barely gets a turn.
— Wrapper (like Prebid): all partners are asked at the same moment, with one shared timeout, then the best bid wins.

Tiny example: five raw tags loading in sequence can take 5 seconds. A wrapper asks all five at once and finishes in one.

1. Pick one wrapper.
2. Move every partner into it.

In plain English: a wrapper asks all bidders at once instead of making them wait in line.