Something I have always wondered "why" about is that when you do a normal ./?a=123 style of link a NOTICE link is created between the two assets. Which is VERY helpful.
However, when you use a %globals_asset_url:1234% style link there is no NOTICE link created. Personally I would expect one to be created so that we know everywhere on the site that a page is linked to, especially when deleting an asset.
Is there a reason why this wasn't implemented?