Total Control and Accelerator were created as a line to protect direct dealers so they can make a living with it. It's the same reason some dealers like Control 4 or RTI. Honestly, you can read the included documentation built into Accelerator and program your own system. If you had just a MRX-10 and a TRC1280 you could potentially program a very basic one device control system and interface in about 10 minutes. It's a wizard type interface that you fill in the blanks as you move through the programming steps.

TC is sold to direct dealers only so that it stays off the internet AND so that URC can make a guaranteed minimum sale for a direct dealer opening order.

Let me edit my post to ask what is your expectation of going to a MRX10 and TRC1280 that you couldn't do with a MX5000 and MRX1 or even a MX980 and MSC400?