FWIW, having experience of DCC with my On30 stock, I wouldn’t consider any of the proprietary command/control systems, which are all unique to 3R O Gauge. DCC really is that much better than all of them.
DCC is widely available, standardised, widely supported from the trade and with a wide range of sound libraries available. It works well, without the problems of fragile external antennae on locos. It allows simple wiring, because you just need a good power supply around the layout.
Its not cheap or simple, and it doesn’t address the issue that you can’t, in effect, buy new 3RO locos in “simple”, conventional form, which is basically the market which DCC serves. It definitely requires a certain level of experience to make use of it.
What I would say is that the base cost means it is not something you use as part of a mix-and-Match approach. TBH, I don’t see why anyone would convert a 3RO loco to DCC, or go DCC in 3RO.