VOICING A WANT is not unreasonable. SUING A COMPANY because they choose not to oblige your desire IS. I may really want General Motors to offer Wireless CarPlay in my new Car. It has wireless charging, it has CarPlay built-in, and the infotainment system has an external 4G/5G data connection and internal wifi. All the requirements for Wireless CarPlay are there. I can write emails, make phone calls, start online digital petitions, and even mail out letters. But, if General Motors says, "No. Plug that phone in and enjoy the CarPlay experience we offer." I don't have a right to sue them. I knew what was available when I bought the car. I might hope for something to change on it, but there's never a guarantee. GM build the vehicle and decides what they will offer, support, and warrant.
Now, take that analogy a step farther. I can modify my GM Vehicle with an aftermarket Apline stereo and gain Wireless CarPlay. But, in so doing... I might lose access to the specialized features of my air-conditioner, because that software and interface was part of the GM infotainment system I removed. Will GM fix my air-conditioner software? No. And I have no basis to sue them for it. Same with Apple. You can modify the device through jailbreaking to allow side loading of apps through 3rd party App Stores like Cydia. But, in doing so, I lose my right to complain when some other software component stops working, errors, or loses support due to inability to implement future security and OS updates.
The real question - and the one that the judge will ultimately define is what constitutes "the market." If the market is "App Stores," then Apple will win. If the market is "Smart Phones," then Apple will win. If the market is "Digital Game Shops," then Apple will win. Only if Epic can convince the judge that the market is very narrowly "iOS App Stores" do they have much chance of getting Apple declared a Monopoly. Further, since there is no evidence (or even accusations of) collusion between the different game and/or app stores - Apple, Google, XboxLive, Sony PS Store, Nintendo and its multiple stores for every device they sell, etc. - who all sell software for the same 30% cut, then there is no grounds for anti-trust litigation.