When operating an appliance that uses an INFRARED remote you are required to be at line of sight for the beam of infrared to be recognized by the TV or music system or whatever. THen how does a cordless phone work? You are not required to be at line of sight with the phone itself. So why dont they make all remotes like a keychain, when you press a button it "projects" its key map on the air, you do your thing and it will "transfer" the command itself to the receiver in the same manner as a cordless phone?
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Cordless phones use RF, because RF is more robust and flexible than IR.
IR is significantly cheaper than RF to implement, plus limits you to the device in that room.
If you need RF, you can get universal remotes that send to a remote base, a remote extender for normal IR remotes, and few devices have RF remotes as an option or as stock.