I don't think it's true that digital isn't made to sound round and welcoming. It's more about the problems surrounding the digital.
For example, you could make the most amazing product, calculate every little detail, every nuance, you could even make it 'better' than its analogue counterpart...you could digitally mimic whatever happens in the real world and more.
Problem is, you then need the cpu to run this powerful product, with a low latency too, on computers all around the world etc. And it must be as cheap as possible.
It can be tricky balance.
In terms of Leslie simulations I'm the first one to say that we are not there yet, some companies claim their product is perfect but it's not, let's be honest.
Yet, it's good to have options that won't brake the bank or your back and in many scenarios (like in a mix) these emulations are indeed getting really good.