A huge problem is the DMA falls short in addressing a significant violation of property rights concerning the hardware. At the core of property ownership lies the right of exclusion – the ability to exclude or include something on one's personal property. This right is quite important and can even be used to derive most other property rights; please see the linked paper at the bottom. However, Apple's policies with i…
The DMA (seemingly) didn't target root of the problem, so Apple was able to easily just sidestep the legislation by saying "okay, you can use alternative app stores now, but the app stores and all software on them still has to be reviewed and approved by us, and we're going to continue to impose conditions (including payment) on that approval". If they had been completely stripped of the ability to exclude software from my device, then they wouldn't have the leverage to impose these new rules in the first place.