Disclaimer: I am no longer an active 3-railer. (But I do like it.)
As an avid modeler in Wienie Scale (HO), I like the bells n' whistles (literally) that my Tsunami 1's, 2's, Loksound, QSI, etc, DCC/Sound decoders provide. DCC/Sound was a game changer for me in HO.
HOWEVER...
When it comes to my still-resident 3-rail tastes, I think that, should I ever return to 3-rail (because of eyesight, dexterity, etc), it would very likely be with select Postwar (Baby Hudson/Berks PW steam, Alco FA's, 6464-type rolling stock etc) in a 1950s "city" setting of sincere scenery. Back in my 3-rail days, I was most content with the simplicity side of things. When I started trying to make 3-rail a stand-in for "scale", my 3-rail house of cards collapsed on me, and I went back to 2 rail (S first, then a return to HO).
In retrospect, my lesson for me and 3-rail: As long as I was playing with "traditional" sized trains, I was accepting of the center rail. When I tried to make it be something else, the center rail became a big distraction.
Having said all this: I had Postwar and I had some more modern tech. (Lionel and MTH w/early sound and such.) My umpteen years old Postwar NEVER failed to perform as designed. My newer tech failed in regards to electronics.
Yes, to me it's apples to apples: Toy trains SHOULD be designed to be played with over the long haul. The older stuff accomplishes that goal decades in, decades out, with minimal maintenance. The newer stuff may be capable of doing so mechanically (though I highly suspect plastic gears won't go the distance) but likely the electronics will let you down. Thus, IMHO, they fall short in the "designed to be played with" category.
The above from the "FWIW Dept."
Andre