2 huge things...
Basically, when it comes to session view, Live stands alone... That is a major reason why so many people use it even though it is weak in other areas. Bitwig is an exciting development because it offers an even better core clip launching function than Live (better integration between clip launcher and arrangement) and it has some other compelling features.
I haven't purchased Bitwig (yet) because it still needs plenty of work. Plenty of people who are interested in it and even bought it, understand it is a work in progress. There is a lot of continued interest in Bitwig even though it is still in a rough state because Live is the only other option and it has some frustrating flaws that may or may not be addressed in a timely manner. Studio One is not a viable Live replacement, and so it does not matter what features it has.
Like i said for the price of bitwig you can have two daw's perfectly synced and actually capable. However, on it's own, Fine, it's a live performance tool then, but no daw.
The modulation thing is not a big deal *at all*. Where did this suddenly become a big thing? Reason has been doing that since version 1.0 and does it better than anything else ever will, and with an ever expanding library of on board devices and RE's. And the on board bitshit devices are just that, shit. I was laughing about how ordinary the factory synths and effects were. So who cares, i can route them in many ways, to blend shit with shit. LOL.
Or get mux and even though you can do less, at least do it with VST's.
SO we are back to one big thing. the clip launcher. I know sonar does it but I am not sure how as i haven't used that functionality. But i do know sonar basic entry level is a MUCH more capable and better DAW than bitwig. Sonar basic + ableton basic = half cost of bitwig and infinitely superior. Another example.
Bitshit has been marketed as an overall DAW, and it's just *not*. Well, not compared to anything else in the market, even n track (cues laughter). It's a basic, stripped down, ejay type music maker basic basic BASIC program. With 2 fancy features. LOL.
The modulation system is a big deal... and it works with VST's too... which Reason doesn't do. Bitwig's modulation system is a joy to work with.
I think you have a hard time with the concept that not every one is the same. Just because you find something that fits your needs, does not mean it will fit everyones needs. If Bitwig doesn't interest you, that is perfectly fine... but there are some excellent things about it.
There are more than 2 fancy features.
Lots of people are excited about Bitwig because it runs on Linux.
The plug-in crash protection is sweet.
The Open Controller API.
Then there are lots of features that Live users would love to have...
multiple audio events within a clip and some sweet editing
multiple projects open at once
64 and 32 bit plug-ins both can be used
and of course automation pdc...