[2022] Why Remove the M4A1?

In this response to a comment, it was revealed that the M4A1 was being replaced. Will it just be replaced with a better model? A different weapon entirely?

If it's the latter, I have to hard disagree with this decision. While weapons like SCAR and the G36 are nice, and while you can argue guns like the 416 and SR-16 can take the place of it, I appreciate it's more plain, bass line nature. It's also by far still the most wildly used weapon by police.