Exactly why I love this forum!
I would have to agree with the assessments that true musique concrète is more with that unlistenable, bland academic/serious milieu. The term certainly gets thrown around a lot in regards to underground/contemporary artists - a lot of times questionably, but it's also nice to think of this style being hijacked from the clowns of the past. I would hope that in my naïve descriptions of modern works on here, that I always called it concrète-ish, or -like, or -type, etc... I think there's very few supposed virtuosos that I actually enjoy. If we can pretend that Spectralism falls in there; well, I think I like quite a few then: Rădulescu, Dumitrescu, Dufourt, Saariaho... but that must be a mistake on my part.
As far as (sort of) old-timers nailing it, and since this is a playlist topic: Ákos Rózmann's Tolv Stations 7CD set is fucking magic. Was uncertain if I should go all out on a near-7 hour piece, but I'm so glad I did. Way more variety, intensity and perfection than I had counted on. I like SOMA when he does this and doesn't make more guitar drone. Kudos.