DCS was a strange way to go, BUT, remember, MTH models still operates on DCC just fine, with some limitations, which honestly, I doubt many would miss. I own about 10 MTH models and have never run them on DCS, only DCC. I don't even own a DCS system. My only complaints with DCC limitations were:
1. advanced consisting, but now you can do it on DCC with their latest diesels (but not the steam models yet, as far as I know), and
2. programming the address, which had to be done 'on the main' via CV 17,18, but even that has changed. I was able to program the address of the new Allegheny as I would any other DCC model using the standard programming menu features of an NCS handheld. For programming (on the main or programming track modes), I have a short piece of flex track on my work bench hooked up to an NCS handheld and do all my programming (MTH, BLI, etc) there.
You can't quill the whistle on MTH locos with DCC, but there are some nice whistle features that work with DCC. For instance, one button forward (two short whistles) and reverse (three short) signals, one button crossing signal (two long, one short, one long).
Aside from that, for the most part they've been trouble-free (I had a GS-4 that stripped a joiner to the motor shaft and had to be sent back for repair), strong pullers, and in my opinion, some of the best 'chuff' sounds of any sound system. You don't have to chuck your DCC system for DCS.