I am a "newbie" at decoders, but after planning for about 40 years, I decided to get rid of H0 scale and go fully N scale. But not before I saw perfect couplings between cars, locos (Fleischmann Profi), plus I could get it all DCC. I now have a 2,40m x 1m layout where I mostly have the theme "diesel". With all those soundloks of course. No sound - no buy.
There is only one loco eating up my DCC decoders, Fleischmann's RC2. That is because the original construction is hopeless anyway, prone to short-circuiting already before the DCC decoder is in. The construction is electrically hopeless and should be recycled and reset ASAP. And you cannot digitalize something that is more or less broken from day one.
Bottom line, I think quite a few locos were made "digital" way before they were ready for it. Of course they burn DCC decoders when the solderings of the print make contact with the bogies in sharp curves, and so on... ![]()