To be honest I’m not really sure what the deal is with these footers so I’m not really the person to ask. But you can ask Eros233 on their message wall as they’re the person who’s been editing the Gacha Footer.
There is much more application range, of course. This would help reducing redundancy! Currently all the work that is the same in every wiki has to be done xxx-times. With template inclusion from Commons enabled we only have to do that once.