So, I agree with you. But here's the thing, you have property rights.
I am no lawyer, but I am a human who can think morally and ethically, and I would say this: a company cannot sell a thing and then restrict the usage of said thing. An iPhone is sold to you. iOS, otoh, is licensed to you. It is my opinion that Apple either needs to make it possible for the purchaser to replace iOS or Apple needs to make it possible to run arbitrary code on iOS. Anything else restricts the rights of the owner of the phone, and essentially violates his/her ownership. In this case, Apple should be able to be taken to court for theft and/or fraud.
I am no lawyer, but I am a human who can think morally and ethically, and I would say this: a company cannot sell a thing and then restrict the usage of said thing. An iPhone is sold to you. iOS, otoh, is licensed to you. It is my opinion that Apple either needs to make it possible for the purchaser to replace iOS or Apple needs to make it possible to run arbitrary code on iOS. Anything else restricts the rights of the owner of the phone, and essentially violates his/her ownership. In this case, Apple should be able to be taken to court for theft and/or fraud.