Appreciate your feedback, @johnmax.
While we absolutely recommend that @Plinian utilize their original installer, or even find another dealer via the Where To Buy tool as
www.lutron.com/wheretobuy, they could attend a training in a pinch in order to make edits for their system, an option that has been available since RadioRA 2. We understand your concerns and collaborate heavily with local Lutron representatives and dealers. We always recommend that homeowners utilize their local dealer network to make modifications to a professionally installed and believe this is the best path to take care of the customer; but there are back up options, just in case.
We also recommend discussing the system comparisons between RadioRA 3 and Caseta, such as the device limit differences, availability of Clear Connect Type X devices, the Lumaris tape light (RA3 only), and more.
We've provided a few resources below. Thank you!
https://radiora3.lutron.com/us/en/
https://www.casetawireless.com/us/en