For what reason do you think a stock exchange would want to add artificial delay to Bitcoin deposits?

I could see holding a portion as 'pending' until many confirmations, or perhaps until the Bitcoin can be liquidated on the market, but both of those seem like they could still resolve an order of magnitude faster than the 'competition'.

The very same reasons they have delays right now. Institutions are able to move money pretty quickly and cheaply between themselves.

The reason you don’t get that as an end user is because of compliance, fraud, etc.

I'd argue that Bitcoin would eliminate the fraud aspect (users can not 'fake' deposits), but compliance could certainly remain as an issue.

In some cases, the financial institutions could be slowing things down so they can segment the market and have paid versions of similar but quicker services.

Could be an interesting aspect to look into?

They might want to check that your wallet isn't on a blacklist.