The only group of people this is "revolutionary" or a "game changer" for is folks that were too stubborn or pennywise and pound foolish to buy these locos when MTH was making them.
Yes, you would have had to buy a DCS system to run them in command mode but they still would have functioned beautifully in conventional mode, which is fully supported by the Legacy Remote and a PowerMaster.
Now with MTH restructured and Lionel in possession of some subset of MTHs back catalog of tooling, you might get a chance to buy a former MTH locomotive with Legacy, IF Lionel bought the tooling and IF they decide to release it (in a road name and paint scheme you want) for a much higher price.
What's the saying that 3rd Rail always uses in their announcements? OH, I remember!
"You can sit on the fence, but all you'll have is a sore behind!"
While I don't own a Legacy command base or remote, I do own the original TMCC and several Legacy and TMCC engines. I also own DCS and several MTH engines. Having both systems allows me to run any locomotive how I see fit, and best of all - take advantage of the used market. Much of my collection has been bought second hand.
Personally, I feel markets are best served when there is good competition between at least two big players. Chevy/Ford/Dodge, Intel/AMD, Canon/Nikon, the list goes on. This drives innovation and differentiation and everyone wins.