I just think that Google should set a certain bar that says that an Android must contain X, Y, and Z features to be marketed as an Android phone.
Is it really feasible to set standard features that all carriers, all manufacturers, and all users must agree to in order to use the Android system? Enforcing features goes against what I believe Google's objective is with Android (universal adoption). For each requirement that Google makes, there are a number of carriers, manufacturers, and users that will decide
against selling, manufacturing, and using Android devices as a result.
For example: Android permits users to enable non-Market apps to be installed. While this is an OS option by default, there is no requirement that carriers extend this option to users. In fact, AT&T turns this option off, and does not allow the user to change that setting on AT&T-branded Android phones. If Google decided to require this option to be user-accessible, AT&T might decide not to permit any Android devices to operate on their network. If they do permit those devices, they may decide to require users to purchase a premium service rate for that extra feature.
Either way, users might be excluded from Android either by a carrier decision not to sell the device, or by the user deciding not to pay a premium rate to operate the device. Other examples: Tethering, VPN, Enterprise Email, VoIP, Video Chat... many of these are options that carriers in the past have charged premium fees for or disallowed on their phones. Right or wrong, it is ultimately the prerogative of the carrier to decide whether or not a device will be permitted to operate on their network, and what level of service and pricing to extend to the user.
If Google required any of these features to be standard on the Android platform, they would ultimately be excluding users from that platform. This is acceptable for Apple, which targets a premium market and is not overly concerned with market share because they maximize vertical profit from all stages of their standardized premium user experience.