Customer admin list filter LIKE 'X%' - Why not LIKE '%X%'

Is there any reason why the admin customer model indicates a filter query indicated in the subject, rather than a full LIKE '%EMAIL%' query? If someone had thousands of customers and unsure of the exact email address, how would one go about locating that customer with a substring query? Shouldn't it be:
Just wondering if this was a security concern, or if somebody just forgot to add the other %.

If I remember correctly, it was a choice. You can cheat using an % yourself but the system would be much better with traditional * and ? wildcards in the frontend.

Thanks for clearing it up, Ryan!