The situation sounds very similar to what happened in Argentina. About 30 years ago, Argentina's education level was good. In the name of social justice , high school standards were significantly lowered by the populist/socialist ruling party. Low grades started to be considered 'stigmatizing' for the students. The effect is that now there are some children that finish high school without being able to read fluently.

Don't be like Argentina.

However, regarding math, if there are cognitive research studies that justify delaying some topics, I don't consider that as negative.