I think ProTools is very misunderstood. Just to preface - I don't use ProTools....I can't afford ProTools...etc.etc...and I am not claiming to be an expert - but here are my perceptions
1.) The Digi001 is no-way-no-how anything like "ProTools" of the pro world. Digi001 is/was an attempt to make a name in the lower homerecer market...and, it was a good one...even though it is dated now. I imagine eventually you will see a Digi2002 that will have 8XLRs, etc. who knows.
2.) "Real" ProTools is more about how the hardware works WITH the software...than it is about the two separately. ProTools is not the best multitrack software...the hardware probably isn't the best..blah blah - however....
When you work in a major studio on major projects with time contraints for 14 hours a day....you can't be messing with a mouse. You need to have LOTS of controls that you can fiddle with....and you need them to work perfectly with the software. Basically....taking digital and making it "seem" like the olden days. Becuase it is much more useable. So it really doesn't matter if their software is the best...or their hardware...their *total solution* is in my opinion the most complete thing out there for a big studio working endless hours per day.
It's less about "what can protools do that i can't do"...it's more about what can a 20 year experienced audio engineer do with it. He isn't going to be too happy sitting down at a computer with mouse and keyboard, mixing tons of stuff in Cubase - even if he could get the same sonic result. it isn't comfortable...
3.) Another issue to comfort is the visual aspect of a complete protools system. Having 64 track fader system, and whatever other goodies protools uses (i've looked at the diagrams..but, can't recall) on 2 monitors looks *real* to clients like madonna. You can't tell madonna that your PC can get the same result....and that she just needs to sing and not worry about it. Truth is - artists are very impressionable to ALL THINGS visual in the studio...and big mixing boards are one of them. Protools gives you the look and feel of that - even if all you need to use is the PC.
4.) In terms of the real sound quality...it still comes down to your preamps....your microphones...your expertise. i don't think ProTools is severely lacking in "sound quality"...I'm sure it's basically as good - the newest stuff may be better..than whatever Logic 5, etc. At any rate, its gonna be close. TDM isn't a big factor to me...becuase I am not a big plugins guy. But I guess TDM has a certain stigma of stability along with it.
In conclusion - Protools is a smart way to do business. You get people hooked...you get people to buy into the full system,or nothing at all...you make the big bucks. If I had 30 grand laying around...I'd drop it on a big protools setup....I am already trying to figure out a good way to get automation with my PC. And..its a tough search.
If I was starting a company...I'd do it like ProTools. Thats kind of what EMagic is leaning into right now with their LogicControl...making hardware and software. Obviously there isn't room or opprutunity for ProTools or Emagic to start making preamps...they are software companies at heart. But, just like the mouse revolutionized computers many a year ago....i think within the next 5 years it's going to be rare to see a lot of recording software worth its salt that doesn't offer hardware to complement the system. Faders...display clocks...whatever. It's not only where the money is...but where the increasing demand is. If you worked on your music 16 hours a day on just a PC...you'd be ready to kill your mouse and keyboard after a week. and THAT is why people (big shot top engineer dudes) buy protools and love it.