You want the EU to regulate whether a company wants to put a headphone jack in their devices?
> OS slow downs
iOS has gotten faster over time [1].
> mysterious battery underperformance
It's common knowledge that this was an honest engineering mistake because as a phone ages, the battery cannot support the max voltage of the processor. Apple now lets you enable full performance with the understanding that your phone might shut down on you when you need it most.
> app store
Which we've determined not to be a monopoly as Apple is a minority player in the mobile device space.
> the list just goes on.
So you've suggested 4 things, 3 of which don't apply and 1 of which (headphone jacks) would be gross governmental overreach.
It seems to me that you just want the company to burn and you want the EU to regulate the hell out of everything in your life.
For example, deciding whether I want to put a headphone jack on my next device is my choice, not the EU's choice, and it would be tyrannical and innovation-stifling to let them have a say over something like that.
It is very reasonable for you to just buy something else if you don't like an Apple device, since Apple is not a monopoly in the mobile space. However, neither you nor the government should have the right to force Apple to develop a product you like. Apple does not exist to satisfy your whims.
[1]: https://arstechnica.com/gadgets/2019/09/ios-13-the-ars-techn...