I did a GmbH with "Musterprotokolle" so virtually no lawyer fees and quick and easy to set up.
And a GmbH is limited liability. It's in the name. Gesellschaft mit beschränkter Haftung. GmbH.
The Geschäftsführer is liable for certain (avoidable) things in either case.
The difference is that that the Co KG can be taxed like a "Personengesellschaft". So you wanted to optimize taxes, which leads to a more complicated structure.
You are certainly allowed to choose such a more complicated setup if you think it's better for you. But then don't moan about it being complicated. It was your choice.
I don’t understand why you’re deriding someone for explaining why establishing a common business structure is slow and complicated.
The fact that a less advantageous business structure is available faster, but with significant tradeoffs, does not diminish the problems with this business structure.
It is not this complicated to set up a limited liability company in Germany. It is this complicated to set up his choice of a two company setup. Which is, I repeat, his choice and much rarer than a GmbH, at around a 5-10% ratio. Because it is more complicated, not just to set up, but also to run. You have two companies, so two sets of books, two sets of audited returns etc.
Which is why most companies are not GmbH & Co KG. They are plain GmbH. A GmbH & Co KG is a much more complex setup and known to be a much more complex setup. Which he knowingly chose.
And his claim that this is somehow necessary for limited liability, which would be a legitimate "significant tradeoff" is simply not true at all. That's what the GmbH is for.
Now maybe he was badly advised by his lawyer, but then complain about the bad advice. Not about the consequences of choices you made.
Also, if you believe in your product there usually isn't a reason to go for a GmbH this early. You can send invoices a lot earlier with just a eK or GbR. Its not an issue to adhere with your private money if your product isn't causing damages.
Might happen really easily though. E.g. you install some package which has been compromised, infecting your software product and suddenly all your customer's systems are cryptolocked and you are on the hock for millions of €€€.
Or your db crashes in new and creative ways and your backups don't work for some reason and now your customer lost an expensive contract because critical data that was in your db is gone.
Of course, you can try to foresee every eventuality, but you will indubitably overlook something and probably never make it to market.
(if there's anything Germans like as much as bureaucracy it's insurance)
Professional indemnity insurance
Business interruption insurance
Directors and Officers (D&O) insurance
Commercial legal expenses insurance
nowadays Cyber insurance
I think I might have forgotten one or two...
If you additionally want to avoid being taxed when you sell stock, the entire company, or transfer it to another country, you'd create two UGs, one as the primary company, the other as a holding. That takes 2-3h for both and costs typically around 800€, but can be had for as little as 400-500€.
This is what previous German YCombinator startups have gone with and recommended in the past.
Going one step further, because a UG is so easy to start, banks will refuse to loan you money in the first year, so you can only raise money by selling shares. If you want to avoid that, you can start a GmbH with an UG as holding instead. This will take a month and requires you to sign over at least 12500€ of assets to the GmbH.
Now, what if you want all of that, but you also want a shell corporation to hide the owners and investors? Then you'd start a GmbH & Co KG, where you set up a limited liability corporation, a shell corporation with multiple special classes of stock, and potentially additional holdings. This is what OP went with.
But the GmbH & Co KG setup the poster wants is not needed for limited liability.
You get that with a plain GmbH (or UG), which is much, much simpler to set up.