UDF Interface post WF2...

We are going to switch to WF4 in a few months and I am going through all of the UDF's to ensure they behave as they should and I noticed something. Most UDF's that we've made are placed using the new UDF interface. Several of them, however (attached) uses the old interfaces that walks through placement rather than the "slick new" interface. Can anyone explain why? I don't mind the new interface BTW but like others have mentioned, it presents itself as something you need to figure out rather than something that shows you how it's to be placed. It also requires more mouse picks.