Earlier quoted context omitted.
I am French and I went through the process of immigrating to both the UK and the US. While I agree that France is particularly painful about burocracy, what you describe is not a breeze elsewhere either. You have to compare with other systems, cause I don't know of any immigrants who can say "oh coming here was so easy". That is unless you're sent by a big company who takes care of everything.
I agree that other countries are difficult, too. France moreso I think, but not alone in all of this. Which is why I'm arguing the difficulty in working in or starting a company in France is not money, it's navigating all the administration you need to do. And you won't know all there is to do until you do it. And since the laws change periodically, not even the prefecture will always know. I had immigration lawyers…
I agree that coming without planning to learn a bit of french might be a burden.