@Lou1985 posted:100% agree we'd all be ahead if 20+ years ago Lionel and MTH just adopted the DCC standard every other scale uses. But 3 rail has to be special.
Also people complaining about the cost of having both systems are being a bit silly. 10 years ago the cost to have both Legacy and DCS on a layout would be about $550, so the price of one locomotive. When someone with 100 locomotives and a large layout complained about the "cost" of the other system it was basically a brand loyalty argument.
Definitely agree with your first statement - it's one of those things where hindsight makes me shake my head and wonder why we let it happen.
Re your statement about "cost", I agree that the dollars are inconsequential compared to what we pay for a locomotive, but I disagree with your conclusion. To me, "cost" doesn't refer to money - it refers to the hassle of having extra wiring, extra remotes with different buttons, remembering which engines are Lionel vs. MTH, and possible electrical interference and other considerations.