The way I read it, this would require device manufacturers (like Apple) to build in some mechanism to allow them to (as the result of a warrant) break encryption. This is no small thing. This would break Apple’s privacy foundation.
I think framing this around Apple kind of belittles the impact here: this is fundamentally breaking the idea of encrypted, private communication full stop.
Two years ago, the Republican-endorsed leadership at the FCC tore down net neutrality, and now the same party is coming after your right to have any private communication. I can understand the perspective that law enforcement would greatly benefit from this information in extreme cases, but it's not just a matter of officials getting this data, it's the fact that a back door is a fundamental security flaw in encryption and those flaws tend to get compromised.