Again - thats IT/HN mindset. Who is going to train the accountants to deal with git conflicts? Or are you just going to employ and IT guy that babysits the VCS when you could just spend $100 more to get an accounting package with built in networking? This is all about how this will be practically done in a business context, not whether a hn hacker can throw together a clever hacked solution.
> Does it cope well with multiple simultaneous users?
If you know of any other software that copes better with simultaneous users than git/modern dvcs+text files I'd be very surprised?