I believe consumer choice is essential to making markets efficient. I think more of it is better. For example I also think we should have a right to repair, so companies are forced to give me a choice to repair instead of throwing away and buying anew. Sure, you could say I could just vote with my wallet and not do business with any company that does not prioritize repairability. But in reality that doesn't work because the vast majority of companies don't do that because it's in their interest that I need to buy a new thing every couple of years. So I need a right to repair law to give me, as a consumer, some reasonable choices that it's not in the companies' own interest to give me.
Exactly the same thing goes for what I do with the devices I buy, and what software I install on them. It's not in Apple's interest that I have a choice of what source of apps I use - but giving me as a consumer that choice would expand the market (e.g. by making it possible to sell an app-based service with a 20% profit margin - currently if you tried to make one, you'd lose 10% on every sale). So yes, consumers currently have a choice of which side of the duopoly they want to live on. I believe more choice would be better, both for consumers and for the ecosystem as a whole.
Exactly the same thing goes for what I do with the devices I buy, and what software I install on them. It's not in Apple's interest that I have a choice of what source of apps I use - but giving me as a consumer that choice would expand the market (e.g. by making it possible to sell an app-based service with a 20% profit margin - currently if you tried to make one, you'd lose 10% on every sale). So yes, consumers currently have a choice of which side of the duopoly they want to live on. I believe more choice would be better, both for consumers and for the ecosystem as a whole.