I call it in-band linking. And yes, it’s bad practice. Some people work around the issues of in-band linking by having the repeater send no PL during IDs, courtesy tones or hang time. That will work in a pinch if you can get the repeater to do those things. But it’s a funky way to do AllStar. All you get is IP linking and can’t take advantage of 99% of AllStar’s features.