Pretty darn easy to argue with what they're saying. In fact, you've made a good argument against it right here.
Apple customers aren't lobbying government to make these changes. They are, for the most part, happy, which is why they are Apple customers instead of Android users.
It's companies like Epic Games (Fornite) that want to profit from iPhone's marketplace but not play by Apple's rules that are driving these supposedly consumer-focused plans. They accuse Apple of being "greedy". Fine, Apple is greedy, whatever. But so are Epic and the others, who want all the benefits of being on Apple platforms but don't want to play by the rules, so they whine to and lobby Congress and administrations to change the rules, while pretending their just sticking up for the little guy. This is baptists and bootleggers in action.
You're right; they should keep their hands off, butt out, and let consumers make their own decisions. The last thing we need is government stepping in to "help". Their dream phone would be one with no first party apps installed, and a long list of questions: Which browser would you like to install? Which email client do you want to use? Which of 50 apps stores would you like to shop? Congratulations, your phone is now ready to use, 10 hours later!
Grr, it's hard not to argue with what they're saying. It's such utter BS from clueless people who think that they can run large, successful, and popular technology firms when they can't come even remotely close to balancing a budget. Apple (and Google) is immensely popular; the same cannot be said of politicians and bureaucrats.
(My complaints, by the way, are not in anyway limited to the Biden administration. They apply to both parties, and both the executive and legislative branches).
I realize I'm ranting at this point, but this crap ticks me off. Apple et al are successful because people, for the most part, like them. Stop trying to screw this up!