Other than Bose, I know of no manufacturer that manufactures AV gear with any RF receiver.

The RF extenders receive RF and convert it to IR which the AV gear does receive.

Manufacturers use different RF frequencies because there are laws that differ between regions that require them to use certain RF frequencies.

There are a number of light and appliance control systems sold in Europe that use 433.92MHz. Many can be controlled directly with the 433.92MHz RF from the European models of the Pronto & Marantz remotes.

     [Link: mbx-usa.com]

If you expect to use the RF, now or in the future, you need to buy the model that works with the RF receivers you may wish to use.