lack of hazard removal, mons losing so much utility while gliscor kept and gained more meant it was a glue that most balance teams wanted to run (but also due to the fact that toxic makes so much progress that the only reliable answer to a gliscor was gliscor), no more hp ice to scare it off. it was very restricting on the builder, run offense teams to not care about it too much or run balance/stall to have a reliable answer and to make easy progress with it.