If you teach kids in such a way that all of them achieve the same standard, some of those kids are going to be achieving below their ability level, and that's not fair to those kids. Some kids are going to need a lot of support to meet the standard. Some kids aren't going to need very much. But the kids who don't need much support to meet the standard probably COULD be doing much better than the standard, if they weren't being given a lower degree of support in order to equalize the unequal!
Kids on the autism spectrum sometimes get put in regular classes, even if they're special ed students with IEPs. In those classes, they are usually seriously bullied (i.e. abused) by the other students. When a teacher tells a class, "get yourself in groups and do X," any autistic kids are likely to just stand there and have no idea what they're supposed to be doing. If they do manage to engage with a group, they're extremely unlikely to have any concept of how to have their contributions to the group roughly equal everyone else's, or to be able to effectively manage any other aspect of group work. The kindest thing you can do for an autistic child in a regular class during group work is to just let the child work alone, with lots of teacher support.
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Kids on the autism spectrum sometimes get put in regular classes, even if they're special ed students with IEPs. In those classes, they are usually seriously bullied (i.e. abused) by the other students. When a teacher tells a class, "get yourself in groups and do X," any autistic kids are likely to just stand there and have no idea what they're supposed to be doing. If they do manage to engage with a group, they're extremely unlikely to have any concept of how to have their contributions to the group roughly equal everyone else's, or to be able to effectively manage any other aspect of group work. The kindest thing you can do for an autistic child in a regular class during group work is to just let the child work alone, with lots of teacher support.