I'm not sure what a "complexity" accountant is, but there is more to accounting than software. Yeah, you need a bookkeeper to input stuff, and that sort of thing can be automated more and more, but someone needs to actually understand what is going on. Especially when it comes to taxes and the like, the 'obvious' answer is quite often wrong.

Much like programming, in accounting there are many "That word, I do not think it means what you think it means" moments. Sure, if you can put the right numbers in the right boxes, and the computer program was designed to the exact sort of business you have, yeah, it could do a lot of the accounting tasks. But the problem is much more complex than it seems.