working backwards...
Bit - I thought there might be junk in the project that started this little adventure, but the files I posted had no data in them. They were not long because in fact they had no length.
As far as 10 tracks per player... that's conservative<G>. I have multiple libraries that cover the same instruments, and ideally I'd love to have them all at my disposal all the time so I can decide if this library or that library fits the piece better. And while I don't need 10 string libraries, I'd very much like to add at least two more (more than two really, since Spitfire sorta divided their strings up.)
Even now I have KHS Concert Strings 2, KHS Spotlight Strings, Project Sam Orchestral Essentials, and Presonus Orchestral Instruments all covering strings, plus some oddball string effects libraries. It adds up fast! There is no question that both individual track per articulation and key-switched articulations both have issues (and by issues I mean problems), but dang, having had the opportunity to work with a large-ish template it is absolutely the way to go. I was able to play the same part into Addagiato, Mural, LASS (OK, yes, this guy has more libraries than I would think I need, but...), and anyway it was dead simple to audition the differences. Yes, I would like to be able to work that way, with maybe a few less choices<G>!
Soundblend - Key-switching can conserve the number of tracks required, but it causes more problems than it solves. The biggest issue is that key-switches are not chase-able. So you have to rewind to get the articulations that you want. I have a kludge where I convert key switches to CCs and use CCs to select articulations, but it is a LOT of work to set up for each instrument, and I haven't decided if it is really going to work for me yet.
There is always the load the instruments as you need them approach. It does address some problems, like memory, CPU, track count, etc, but it adds so much tome to the process, and I am kinda tired of working that way!
The good news is that I seem to be the only person creating gargantuan MIDI files, so there may be hope yet until I can afford a fire breathing DAW and half a dozen slaves, and all the libraries to fill them<G>!
I suppose that I have been know to use multiple articulations as an effect, but it is not something you would normally use if you are trying for a realistic mock-up.